[olavfo]

Villain's openraise from MP is standard.

He doesn't know whether you hit the flop or not, and he's got a hand so he decides to take the lead and inform you of this fact. When you raise, he hopes you have overcard(s) and/or a flush draw and he decides to call down.

Many are incapable of folding medium pocket pairs in this spot, so they just call down and pray. It's very profitable (for you).