"Speaking of which, your mom says hi."
I thought that there was a rule that said that delaying/readying actions did not change the initiative when you took ongoing damage/roll a saving throw/until the end of your turn effects occured.
How could it not? Readied actions change your initiative permanently
There's actually another Ready Action issue that we've had problems with. It mostly has to do with the Ready Action being an Immediate Reaction. Scenario:
The player readies and action to attack with his longsword as soon as an enemy moves adjacent. His turn ends.
An enemy 2 squares away with a power that lets it shift 6 moves past the player and ends 3 squares away. At this point, the triggering action completes(the monster's move action) and the player can take his readied action. Except, now the monster is 3 squares away!
The the exact same situation triggers if you ready a ranged attack to shoot an enemy as soon as they move out from behind a wall.
The enemy is behind a wall, so out of line of sight and effect. They run out into the open as a move action and end their turn behind another closer wall, again out of line of sight and effect. At this point the player's action triggers, so they can make the ranged attack, except now the enemy is again untargetable!
This may be beating a dead dog, but say there is an enemy 2 squares away and a player readies an action to blast the enemy with a range 5 power as soon as the enemy moves. The enemy walks 4 squares away as a move action and ends 6 squares away from the player, at which point the player's reaction triggers and the enemy is out of range of the power.
When it came up, we just hand-waved it and let the relevant attack happen while the enemy was actually targetable (breaking RAW) just because the situation was so ridiculous from an in-character perspective.
Are we misreading/misinterpreting something, or is this actually RAW?
Even more explicitly:PHB p.291 said:That way your attack will be triggered by a portion of the enemy’s move, and you will interrupt it and attack first.
PHB p.268 said:If a creature triggers your immediate reaction while moving (by coming into range, for example), you take your action before the creature finishes moving but after it has moved at least 1 square.
PHB page 291 said:"Choose the action that will trigger... When that action occurs..."

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.