Hello,
Raising small pocket pairs from any position is ok, even in FR, as it adds deception in your game.
Dont ever check behind on such a turn, in fact, bet/folding is not an option. I'd bet/call,since I dont see much hands that made the str8 here(besides 55 or the loose call with 45(unlikely hand, since we have the two other 4s).
River is an easy valuebet.5-7$, the ammount you think he'd call.Since the K is a scarecard, I'd make it smaller than on a safe(for him) card.
Best regards,
darkonebg
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