uncreativenickname

IG-11 plays anti-capture protocols for the current round, has already used emergency stims last round (that is - already has two wounds on the emergency stims), and currently has 3 wounds. After ig-11 activates in the current round, what is the timing of the end ig-11's activation? is it up to the controlling player? (ig-11 self destructs before the 2 wounds from the stims get thrown on?) the opponent controls the timing? (the two wounds apply to ig-11 thus defeating him before ig-11 self destructs?) you bet on your dice being hot and agree to roll a chance cube to decide?

Just for further clarification on this: This would also grant cover to the at-st as well or would this have to be declared at the determine terrain step before the game starts? And for further clarification size of the obstruction is irrelevant, just that it exists and that is covering up some part of the cyclinder/silhouette e.g. a box half the size of a trooper provides cover to both (provided neither is touching said box)?