[NLSoldier]

Given your flop call I think you have to raise on the turn.

When he bets into a card that is obviously scary for him considering you are the preflop raiser, he is very often either bet-folding or is on a draw. I Raise the turn and take a free showdown. This will charge him if he has a draw and may get him to fold a nine. I'm probably giving him way too much credit but the reason I think that if he has a pair, its a nine, is because a king would likely either CR the flop or check call the turn. Whereas a nine would probably still bet the turn because there are far more river cards that kill him, making the possible free card more risky.