So lets say you partially block an opponents attack. The window for come to the aid hits. You would fully resolve CttA before the window to play a reversal hits, correct?

Also, i remember that multiple copies of a facedown card have 0 dmg, correct?

I know multiple copies of a multiple can't happen...but the CttA facedown is not a "multiple" copy, its just a facedown card.

I think you would actually play CttA and the reversal you want to attempt right after each other and then they would resolve in the order they're played.

kilik850 said:

Pretty much. They the same window of "after blocks, and damage is resolved."

and yes, the copies would be 0m0d

CttA states "After you take damage," so does this mean it would resolve BEFORE you play a reversal? The opponent's attack hasn't resolved until CttA has.

Correctomundo?

you resolve CTTA itself but the copy of the attack waits until the other attack has finished resolving before you start resolving it... so the timing to play an attack as a reversal is right before you start resolving the attack played via CTTA.