And yes, I do know your feat should protect you from lethal damage. Kinda makes you wonder why it didn't... and why you actually felt the pain like a normal person.
But here's the spoiler because I see the potential for a needless argument.
X12 has had his flashbacks giving him and his companions clues to the bracelet, but never removed his. His actual unluckiness was not the staggering fall (he actually missed horribly, has no penatly to his defense, is not prone, and would have missed horribly even if a hero point was used -- I checked, but didn't let you use one since it would have been a miss), but the fact that his bracelet overcame his innate mental defenses and robbed him of his power. I twisted the rules a wee bit in order to not reveal this outright.
Currently, as he's quickly realizing, he has none of his powers nor any of his (super) feats which have been gained through his powers or mutations. This includes his durability feat. Hence his noticing that the gunshot wound hurts badly, rather than the little sting he expected. Normally, it wouldn't even have broken your skin and you'd have a tiny bruise that would fast vanish.
Anyway, with the exception of one or two minor booboos I do make at work, I'm pretty good with the rules. You and Amazon are really hard to hurt, so in a major battle I have to do one or two things to keep your lives interesting and keep you all off balance. Kinda tough to do when only using one mutant
Anyway, long ramble. You took the lethal hit. You were supposed to take the lethal hit. You don't have your powers. Prepare to defend thyself, strange hairless man!