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Because of the 2 hearts and 2 connected.

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This is exactly why you should wait for the turn. No draws are going anywhere on this flop with this pot size. Make it 2BBs on the turn and gutshots/low flush draws will have a harder time calling.

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Well, it's not gonna be 2BBs on the turn. The flop went bet-call-call, and if the flop bettor leads the turn it will be bet-call-raise, and they will only have to call one more anyway.

So waiting for the turn to raise in order to protect the hand is not possible; though just calling the flop in order to be bet into on the turn and then raising if a blank falls, thus extracting more value - that's certainly an option.

I'd probably raise the flop anyway, while I'm definitely ahead.