Stupid rivercall or following the right read?

[Niwa]

I didnt put him on anything. He raises huge when he's getting 4-flushes and has previously raised all-in with nothing. He's originally a 1000 NL player who has got out of line ALOT.

I just wanted to see if this was so crazy against any random. I just cant see him having either the flush or a higher set since he bets both very aggressively.
I just couldnt believe this large raise on the river. His % of wins going to showdown is less than 2% [img]/images/graemlins/smile.gif[/img]
He was blowing off steam I guess.