I would call his raise on the flop and check call the turn and possibly fold the river. if you had top 2 its a different story but the spade kills you if he was drawing and if he didn't have KT than the ace made his straight to.

there is really no hand here you can beat except a stone cold bluff and that will still get him 1/2 the pot for low.

there is really no hand he could have raised the flop with that doesn't beat you.

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