Hand 1: Played great contingent on your image (and villians). Villian either pushes or lays down as you're repping an over pair or AKh.

Hand 2: I wouldn't think in terms of "defending your sb", it's what .25, so you're going to jeapordize your stack? If you call with that hand you're really hoping to hit an A. The way villian played it, it's either a monster or, more likely, something like KQ/KJ/QQ. I understand calling (and I think I would have too), but you can justify a reraise on turn or river. A big reraise which, if he folds to, will keep villian honest on the river in future hands.