I'm probably stacking off there depending on how good Villain is. If he's a bad player he's calling 3bets with TT and JJ but then can't fold his overpair. I've seen that happen a lot. Whilst there is always the possibility of KK or AA, the majority of the time they're 4betting preflop. So yeah, that's probably a stack off if you think Villain is a bad player. If he's a good reg, he'd be folding TT and JJ the majority of the time there so you can sometimes find a fold.