Does the Assassin take damage when he uses Vanish?

The 4th Edition Assassin class has a Level 6 Utility Power Called Vanish:

Encounter - Immediate Reaction
Personal
Trigger: You are hit by an attack.
Effect: You become invisible until the start of your next turn, and you teleport up to your speed.

My question is: does the assassin take damage from the attack that triggered Vanish? Or do they get to Vanish after a successful attack roll but before damage is dealt?

Interested to hear ruling interpretations on this.

• Does the Assassin take damage when he uses Vanish? - Only if taken internally...badum-tish! – Nat Oct 10 '13 at 0:15
• It is unfortunate that the ability wasn't worded: Trigger: You take damage from an attack to clarify this is in fact after the damage. The ability would be WAY too powerful if it allowed you to avoid damage and become invisible 1/enc. As a DM, I would probably rule against it avoiding damage even if it said it in clearer language, for balance issues. You'll find similar abilities that do actually let you avoid an attack as an Immediate Interrupt, but they let the enemy re-target a different creature with the attack, or force them to hit one of their allies (as a daily power). – Corion Oct 14 '13 at 15:26
• @Corion: There isn't much clarification needed on the power. Immediate Reactions (after) and Immediate Interrupts (before) are clearly defined in the rules. Since Vanish is a Reaction, it happens after the attack is resolved. Also, it is entirely possible to take no damage from an attack (several attacks don't even deal damage), so Vanish's trigger makes perfect sense. – Ellesedil Oct 15 '13 at 18:23