Third hand: did you have high cards (AK/AQ/AJ) or an overpair? I feel like you'd re-raise the flop with an overpair, so I'm guessing AK or something like that. AT is not a bad guess for him, but there's a real risk that he's min-raising with a set and trying to milk you. And if you had AK and hit your ace on the turn, that's a terrible turn of events for you. Did he raise again after you bet the turn?