If this has been answered elsewhere, I didn't see it, so apologies.
This mythic power (and a few others like it) make an enemy who critically hits you provoke an attack of opportunity. My question is this:
Do you resolve the attack of opportunity before the critical hit, or afterward? Will you get a chance to potentially kill your attacker before he can resolve his critical hit?
In my opinion, the spirit of this mythic powers seems to be that you lash back against your attacker when you are struck, thus you get hit and suffer the crit as well. In that regard, I would image both combatants could potentially take each other out at the same time (you from the crit, the opponent from your AoO).
Is this how the mythic power was intended? Or was it intended to interrupt the crit, potentially saving you from any damage at all if you killed your aggressor?
I understand why you're confused since in most cases an AoO happens before what provokes it. The problem is that they say it provokes an AoO so you have 2 options run it in the raw way AoOs work or have it happen after the critical. IMO it doesn't make much since to happen before so under my rule it wouldn't be a AoO just an attack that resolves after the critical.
As a side note that ability is not very good and I'd suggest you or them picking a better one, it won't come into play very often nor is it a very mythic ability. Come and Get Me is that on steroids and it isn't even mythic.