hes betting flop into 3 players that checked to him so his range on this board is sets and overparis and never bluffs.

equity win tie pots won pots tied
Hand 0: 48.977% 48.98% 00.00% 11637 0.00 { JcJs }
Hand 1: 51.023% 51.02% 00.00% 12123 0.00 { QcQh, QcQs, QdQs, JcJh, JcJs, JdJs, JhJs, TT-88, 66, 22 }

you're basically flipping against his range. took out half the combos of QQ and 2 combos of JJ coz i think they 3bet pre most of the time but sometimes the tagfish just flat them.

edit: waht i'm tryin to say is i probably fold but can't really fault a shove.