SpoilerAnd yet in this episode we have one who is definitely wounded by cracking its face. I maintain that it might not kill them, but breaking off the angels head/arms/legs would probably do a hell of a lot toward making them useless.
As to the Amy outlived Rory thing, yeah, that is probably what happened, brain failure there.
Though now I have the mental image of an 80 year old Amy waiting for Rory to come back to life again, just one more time, once he finally passes.