Sneak attack of opportunity

[StreamOfTheSky]

I think the specific mention you referred to is there to make sure your AoO (or evasive reflex) cannot interfere with the incoming attack which granted you the AoO in the first place. For example, you couldn't use your AoO to disarm the opponent before he strikes you, thus rendering his attack ineffective. Instead, if you use your AoO to disarm, the opponent gets his attack in and then is disarmed. Similarly, evasive reflexes would let you take a 5' step away, but even while you're taking that step, you're being clobbered.

I disagree. Unless the ability letting you get an AoO explicitly says otherwise, an AoO should be interrupting and resolving before the provoking action. If you try to grapple someone w/o Improved Grapple, you don't get to grab them (which means doing unarmed damage and possibly more, even if the grab only lasts for a split second) and THEN have them hit you and break the grapple. They get their AoO first, and if it disrupts your provoking action, tough cookies!

 

[Empirate]

Sure enough, Stream, except in the case of Robilar's, which explicitly states the AoO you gain for getting attacked doesn't resolve before the attack that triggered it. See emoplato's post, which is all that I was referring to.
I'm pretty sure that Robilar's stipulation (which, granted, only refers to AoOs) also applies to Evasive Reflexes' 5'-step.