answered in other thread you asked, but will answer here too for benefit of those not in both games:
In most cases I think it'll be fairly easy - If you fail a save by enough that you'd be knocked out, I use a luck point for you. If you have any other circumstances, just post them with your post (IE "Power attack 5, willing to use Luck/HP to ensure hit"), and if something comes up that we haven't forseen, Just say "Could I get a reroll" and I'll do it asap.
Oh, I'm all for having you roll. M&M still sits just a bit off-kilter in my brain as far as mechanics, and lining up online rolls always slows down my posting, so this makes things easier.
I already didn't include the roll, letting you do it. Now, it seems language barrier strikes again, I must have confused feint with another word. I thought he was attempting a deceiving action.