Immediate Reaction: Hits or Misses an attack

Dazing Rebuke
Your sword swing unleashes a barrage of nettling darts of force that punish a foe for attacking one of your allies.
Encounter Arcane, Force, Implement
Immediate Reaction Ranged 5
Trigger: An enemy within 5 squares of you hits or misses an ally
Target: The triggering enemy
Attack: Intelligence vs. Will
Hit: 1d8 + Intelligence modifier force damage, and the target is dazed until the end of your next turn.
Aegis of Shielding: The target also takes a -2 penalty to attack rolls until the end of your next turn.

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Does the triggering creature get to finish its attack in this case?

Reaction: An immediate reaction lets you act in response to a trigger. The triggering action, event, or condition occurs and is completely resolved before you take your reaction...

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Is the "triggering action, event, or condition" just the attack roll, or the whole attack, including any damage and/or effects it might have?

Say a creature marked by a Swordmage moves, then makes an attack. The Swordmage uses Dazing Rebuke.

If it is only the "Hit or Miss" that is resolved before the immediate reaction, there is no damage. Since the daze prevents more than one action, and the creature spent an action to move, the rest of the attack action is canceled.

If it is the whole attack that is resolved before the immediate reaction, the attack gets through no matter what, but the creature cannot take any more actions this round, since doing so would exceed the limits of the dazed condition.

A similar issue exists with the Aegis of Assault description. That one is less clearly worded and thus less useful as an example, but the basic issue is the same.

I'm pretty sure that the attack resolves entirely before the Rebuke goes off. It seems that WotC has chosen to use 'hit or miss' as a trigger rather than 'attack' to avoid these kinds of questions.

The Daze functionality of the attack seems to be for setting up a counterattack rather than protecting the target. Almost all powers that are designed to stop attacks are Interrupts.

If someone's already spent the action to make the attack, nothing can cancel that- some things speficically ending continuing actions, such as fighter's combat superiority and movement, but that's specifically stated.

PHB 268:under immediate reactions "The triggering action, event, or
condition occurs and is completely resolved before
you take your reaction, except that you can interrupt
a creature’s movement"

However it goes on-
"An immediate reaction might interrupt other
actions a combatant takes after its triggering action.
For example, if a power lets you attack as an immediate
reaction when an attack hits you, your action
happens before the monster that hit you can take
any other action. If a monster has a power that lets
it make two attack rolls against you as a standard
action, and the first one hits, you can use an immediate
reaction before the next attack roll."

So each attack is treated as one action, which a reaction comes after.

However dazing a person would never negate an action they had already taken, as they have already spent the action required while not dazed.

For example, you have a ranger marked as described, and they twin strike someone else. They make one attack, you react, they may be dazed, but they still make the second attack, albiet with -2 to the roll from your power.

From Wizards' Player's Handbook 2 FAQ:

1. When you use Avenging Winds do you use it after the target has completed its movement or after it moves one square?

As an immediate reaction you would wait until the target has completed moving but not necessarily until the end of the action, some actions like Charging start with a move but have something else at the end.

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This means that an IR on the movement part of a Charge is resolved after the movement part, which is the triggering condition, is completely resolved, but before the attack part, which is not part of the triggereing condition.

The question here is whether "hit" and "miss" means just the attack roll, or includes the damage roll... I've not looked for an official definition for these two terms, but since you are encouraged to roll damage before attack on e.g. area attacks, it would seem likely that it is included.

You do damage after the target has dealt damage.

If the power was meant to interrupt the attack, then it would be an interrupt not a reaction.

Oddly the Aegis of Shielding (The target also takes a -2 penalty to attack rolls until the end of your next turn), is virtually useless since your next turn is bound to be before theirs and they have already had their attack for this turn. It seems to only help vs OA and Elites and Solos who have action points.

Tuft said:

This means that an IR on the movement part of a Charge is resolved after the movement part, which is the triggering condition, is completely resolved, but before the attack part, which is not part of the triggereing condition.

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The rule on reaction I quoted in the OP goes on to say that you can interrupt movement with an Immediate reaction. I deleted that bit (the ... indicates that) because I felt it was not relevant here.

Bagpuss said:

Oddly the Aegis of Shielding (The target also takes a -2 penalty to attack rolls until the end of your next turn), is virtually useless since your next turn is bound to be before theirs and they have already had their attack for this turn. It seems to only help vs OA and Elites and Solos who have action points.

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Aegis of Shielding doesn't work the way you seem to think it does.

The -2 is from the mark itself, and is applied when you use the power. The immediate action it gives is a) an interrupt, and b) is the damage reduction part.

DracoSuave said:

Aegis of Shielding doesn't work the way you seem to think it does.

The -2 is from the mark itself, and is applied when you use the power. The immediate action it gives is a) an interrupt, and b) is the damage reduction part.

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From the description of Dazing Rebuke above it appears to have an additional effect if you took the Aegis of Shielding class power. That additional effect of Dazing Rebuke is what I'm referring to not the normal use of the power or the mark.

Ah yeah I see.

Works for multiple attack monsters. But that's not that great, because you don't get to use your Aegis itself. Situational at best.

Really sadfaces a Beholder tho.