[stillnotking]

His PF limp was a slowplay, not speculation (how do you speculate heads-up with pocket 9s?). He probably thought to himself before the flop, "I'll just call with this hand and then put it in on the flop no matter what". He's hoping you either pick up a draw or a pair less than 9s.

So from a $20+2 player, FWIW: this is not how I would play the hand. I would definitely push PF and hope to be called by a smaller pair or one overcard. But I would push PF with a very wide range of hands here, and my opponent would know that, so I would be more likely to be called than a tighter player like ComeOnPhish.