Talk:R7 Astromech/@comment-149.136.17.252-20180411172041/@comment-454133-20180411183556

Changing dice to different results (directly setting the result, instead of rerolling) is not the same as a reroll. So forcing the enemy to reroll their dice does hurt them if they want to spend a focus token and you reroll their focus results to blanks, or if you reroll their hits into blanks etc. A reroll also hurts them if they were going to reroll with a lock or ability like Han Solo: the blanks from your reroll cannot be rerolled again.

But an ability like "Omega Ace" doesn't care since it just switches all dice to crit results, regardless of what you rerolled them into (and it's not a reroll effect so a previous reroll doesn't block it). The only way to stop his dice modification (other than stripping his focus/lock before he can spend them) is to use some effect that bans dice modification, which is pretty rare. Emperor Palpatine and Accuracy Corrector only affect your own dice, for example.

But Omega Ace has to work to get that focus + lock anyway, so he doesn't need more ways to be shut down. :)