Hand 1: Set's are VERY unlikely to get drawn out on barring flushes n straights. This guy bets half the pot. Either his KQ / pp missed, or- more likely- he has a strong Ace (maybe even a two-pair axe). If he has a strong ace- like AQ- hes practically drawing dead. (he needs runner-runner overfull). If he has two-pair, aces up, then he needs to spike 1/2 remaining bullets in the deck by the river- not likely. I would not try to frighten him on the flop.