The rules also do not say that any portion of a trigger has already occurred.
RC Page 195 Heading: Triggered Actions
Whatever the type of an action, if it has a trigger, it cannot be used unless the trigger occurs. For instance, a wizard's
shield power is triggered by the wizard being hit. Only when that trigger occurs does the wizard have the option of using the power. /end quote.
So you are honestly trying to assert that the rules do not say that any portion of a trigger has already occurred? I don't know the above quote could be any clearer that the trigger has to occur before you can use a triggered action.
For example, you consider the Shield spell to modify the resolution of "you are hit". You haven't actually been hit yet until the trigger effect resolves. The trigger hasn't yet technically happened.
Let's look to the rules for attack resolution shall we?
RC Page 214, Heading: Making Attacks
<snipped some general verbiage about adventurers having different attacks and they usually use a Standard Action> Whatever type of attack power a creature uses, the process for making an attack is almost always the same.
1. Choose an attack power, keeping in mind the rules for its type.
2. Choose targets. Each target must be within the power's range and must be within line of effect. See "Choosing Targets," page 105, for how to determine whether a creature can be targeted by a power.
3. Make an attack roll, rolling a d20 and adding the appropriate bonuses and penalties.
4. Compare the attack roll's result to the target's defense. The attack specifies what defense to check. If the result is equal to the specified defense or higher, the attack hits the target. Otherwise it misses. However, (auto hit and auto miss verbiage)
5. When an attack hits, it usually deals damage, and many attacks produce some other effect, such as forced movement or a condition. An attack power's description specifies what happens on a hit. Most attack powers do nothing on a miss, but some specify an effect, such as half damage, on a miss.
6. (multiple target handling) /end quote
So, from this we are told several things. There are multiple steps to resolving an attack. So an interrupt could jump in at a number of different places during an attack since the steps are discrete.
Now take a close look at step 4 and step 5. Step 4 describes the roll and the check to defenses and tells us the condition for a hit. Step 5 tells us to read the attacks power to determine how to resolve the hit. So the trigger, "You are hit" occurs at step 4. If the triggered action is interrupt, like say
Shield, we can take a quick look at the rule for Immediate Interrupts to see how that triggered action is going to interact.
RC page 195 Heading: Immediate Actions
Interrupts An immediate interrupt jumps in when its trigger occurs, taking place before the trigger finishes. (we'll come back to the action lost portion in a minute).
Since the attack power description tells us how to resolve the hit and that's step 5 of the attack process; when step 4 indicates a hit, Shield can trigger, jumping in before we move on to step 5, resolve the powers hit description. Right at this moment we have an attack roll and a new defense value. Here's where we come back to the lost action part
"If an interrupt invalidates a triggering action, the triggering action is lost."
How does this effect Shield? glad you asked. Remember above we jumped in when the roll was compared to the defense and was ruled a hit (step 4) but we interrupted so nothing else in the attack or hit resolution has happened until Shield is finished with its work. What does that mean? Well, if the attack roll is no longer equal to or greater than the wizard's defense then the hit is no longer a hit.
Note we did not go back and re-roll the attack, we are still working in the space where the trigger has occurred, as the rule for triggered actions specifies.
So, what about that action lost thing? Since the wizard is now missed does that mean the action is lost? Well, maybe yes, maybe no. The interrupt now being finished the attack continues (the wizard is still a valid target). If the attack power description only specifies a hit effect then the attack is lost at this point. If the attack power has a miss effect or an effect that is independent of a hit, then the wizard will still be affected by those portions of the attack.
I consider the Bear's Endurance spell to modify the resolution of "you drop below zero hit points". You haven't actually dropped below zero yet until the trigger effect resolves. The trigger hasn't yet technically happened because the trigger is being interrupted.
As do I. By the rule for triggered actions, the trigger has to occur for a triggered action to be enabled. So you actually have to have zero or fewer hit points to use the utility. I have post more times than I care to count my contention that the conditions for this state are part of the resolution, I won't type the whole thing out again.
Because, by rule, the trigger has to occur to use the triggered power. The healing can not happen before you are below zero hp. There is no wiggle in the wording of the rule that lets you move the triggered action to a point just before the trigger has occurred.
Same for Combat Challenge. The foe technically has not left his square or attacked yet. The trigger itself is interrupted. He hasn't partially left his square or partially attacked. The trigger itself starts, but has ZERO rules effect implemented quite yet. It's as if it has not yet started at all.
The attack is easy peasy. As soon as an enemy declares your ally as a target in step 2 above, then they have been attacked. The fighter makes his MBA before the attack roll is made. If he kills the enemy, or can modify his MBA to make the ally an invalid target of the attack the action will be lost.
Shift is a little more interesting. All movements except teleports have to traverse all of the terrain between the starting and ending point of the movement. So conceptually, there is 5 feet of ground being travelled by the shift. So the enemy starts to move over the 5 feet and the Fighter attacks him before he gets to his end point. Triggers occur, etc, see above. If the Fighter kills the enemy or he can modify his MBA to otherwise invalidate the shift (like a weapon that lets immobilize on hit), then the shift action will be lost. Otherwise the enemy will finish his shift after the attack.
The problem with your rules interpretation is that you are dropping the PC to zero hit points BEFORE the interrupt occurs. You are not doing this for Shield or Combat Challenge or any other immediate interrupt.
Because the rules for triggered actions say they do. The problem with your interpretation is you are ignoring the rule.
You are saying that the PC has already dropped below zero hit points. The trigger itself has already happened (or partially happened).
The trigger has to occur for a triggered action to be legal.
You are not saying that the PC with Shield has already been hit.
See my exhaustive description above with rules quotes. This sentence of yours is just not true.
You are not saying that the NPC with Combat Challenge has already shifted out of his square.
This is closer, but the trigger is a marked enemy adjacent to you shifts, not a marked enemy adjacent to you shifted. So as I said above, the enemy starts the shift, gets hit, finishes the shift.
With Angelic Intercession, the ally is not yet hit, the interrupt occurs and the Paladin is hit instead.
I don't really want to go look up this power. I've certainly never posted about it in this thread, so you have no idea how I would rule it.
Weave through the Fray is an excellent example because it illustrates how your interpretation is not consistent.
Trigger: An enemy moves adjacent to you
Effect: You can shift a number of squares equal to your Wisdom
modifier.
According to your interpretation, the enemy is already in the square next to the PC when the PC shifts. This is set in stone and the effect of the interrupt cannot stop it. The move into the adjacent square has already happened.
According to my interpretation, the enemy starts to move into the square adjacent to the PC and the PC can shift into that square and prevent the enemy from going there. The trigger hasn't yet been resolved and hasn't yet completed. It can be negated, partially or wholly.
For your interpretation to be correct, this power would have to be an immediate reaction. The foe moves into the square. Then the PC can shift and he cannot move into that square cause the foe is already there.
This one is very interesting, it honestly would never have occurred to me to shift into the square the enemy was moving into. But you are right, the trigger moves adjacent is too specific, I wouldn't let a player shift into the square the enemy was going to move into because he wouldn't be adjacent yet. This is different then Combat Challenge, frankly because the trigger is very different.
It is an interrupt because the enemies movement into an adjacent square has no idea if the enemy has finished movement. So enemy moves next to you, you shift away, enemy keeps moving if he has move speed left. Still not a reaction.
This is the difference between our interpretation. The trigger has started in my interpretation, but it hasn't actually yet happened and the entire trigger can be negated if the effect of the interrupt is capable of doing that.
In your interpretation of Bear's Endurance (healing before taking damage), the trigger has not occurred, it hasn't even started before you take damage. The rules for triggered actions will not let you use the utility before you take damage.
In your interpretation, sometimes the trigger hasn't really occurred yet and in other cases, it has partially or wholly happened already.
This is just a lie. I have repeatedly explained how all of my rulings start when the trigger occurs, not before, not partially. You are not countering my explanations, you are simply lying about what I've been posting.
That's why your interpretation is inconsistent. The trigger has already happened in your interpretation and sometimes you back it up and allow it to not happen and other times, you don't.
By allowing the trigger to partially occur, you are not allowing the action or event to truly be interrupted.
. Your ruling on Bear's Endurance is not an interrupt. When you want to explain your reasoning in detail with rules support, instead of lying about what I've posted in this thread and making unsupported and erroneous assertions; I'll respond to your posts. Until then, meh.