Perhaps it's because a lot of the main house gaming group over here plays Magic: The Gathering, but we frequently find ourselves doing actions "in response" to an opponent's action in combat. That is to say, dedicating the next round's dice to an action in the present. This is almost exclusively reserved for dodging, but it has sometimes also been used for evasive powers as well.
Here's a hypothetical example:
Person A: I punch person B, I get 10 successes because I dedicated my insane dice pool to the task.
GM: okay, you deal 5 damage because of Hands of death. Congrats. Person B soaked it all with their stamina + armor.
Person B: I use my gun to shoot them in the head. I get 3 successes.
Person A: uhhh shit. Can I use my next turn's dice to hit the deck as he does that?
GM: hmm . .. That doesn't make a lot of sense, but there's a precedent for that kind of thing, so I guess so. Dodge at difficulty 8 because you have no cover.
Person A: Hah! I succeed.
Person B: Okay, he skips this turn so I shoot again
Person A: I use the next turn's pool again
Person B: I shoot AGAIN
Person A: I use next turn's pool again.
Etc. etc.
here's an example that uses a power:
Ellis is the subject of a surprise attack, Pulse sees this coming, Ellis does not.
Jennings shoots ellis in the back with her taser.
Pulse, having seen the action take place, takes dice from his next action's pool to use Klashnakov 4: Carnival of Carnage (Bullet parrying). He shoots the pins out of the air as they fly toward Ellis.
Ellis survives another day.
Or here's an example that's perhaps even more dubious:
A shadow dragon wraps its jaws around a naked Dorian. Dorian takes 7 health levels of lethal damage, but is still conscious thanks to being in avatar form.
Dorian uses his turn to summon his minigun and shoot at the dragon with it.
In response, the Dragon takes its next turn's dice pool and uses Shadow Mastery 4 to become a shadow as an evasive action.
Tie goes to the defender, so Dorian doesn't quite shoot it in time. :(
Does any other cell do this? We also split current action dice pools and dedicate some of their dice to dodging frequently… On one hand it doesn't make any sense, but on the other hand, it allows characters to react to actions that, in reality, would be happening at nearly the same time as their own actions.