Flop I'd check as discussed.
Turn I'd bet probably half pot and fold to a raise probably.
River I'd probably fold in a vacuum, KQ, AJ, A9 get there, maybe some slowplayed flop stuff once and again, the way the board is spread out there arent that many unpaired flush draws, Axss turns TP, QT pairs up OTR (admittedly this doesnt mean he'll always take his SD value).
Based on this I'd fold; seeing the spoiler kinda reinforces this in that he needs a hand like that to be bluffing. In future with that guy goes without saying raise larger pre
ul
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