Flopped trips - three flush river, I need a river line

[Fonkey123]

Wow it really looks like he was chasing here, but he could still have a worse nine (maybe? possibly?). I'm probably making a blocking bet here then folding to a push. If he's 30/20 he's building a pot with 5's right? The thing that's worrying me is he called again when the ace came meaning he's either drawing/not worried/ donkish. I'm still going with blocking bet/ fold to a push since people always show up with weird [censored] like AT, 9T, 8's.