When people lead out it's usually mediocre or nothing, here it could be a J, or a flush draw, if it was anything stronger, he would have re raised on the flop, donking out again looks weird, I feel a little scared, but makes sense to just get it in, the guy if he has a jack might have a gutshot, and if not, you'll waste money and give him a chance by calling letting him get there on the river.
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