If i remind right (don't have a card at the moment), cards states "If your opponent is defeated this round, shuffle your combat stack and rest pool into your life pool".
The question is, then the shuffle must accure. Before "f" step of the round - meaning before taking damage, or after taking damage? If follow the rules, then special abbilities are to be resolved before "f" step which allows us to shuffle cards and use newly created life pool for taking damage.
But, to resolve special ability, we need opponent to be defeated this round, and teoreticly we are not sure if he is defeated until the "f" step of a round.
An answer from designers will be highly approciated.