Long story short, 1/2 NL 9 players
Hero (~$450) has A
8
OTB, Villain (~$200) MP, everyone limped, I make it 7, 3 callers.
Board is: A
9
5
J
7
2 Players left after the river through 2 rounds Hero betting and villain calling.
Pot was about $80, - once river hits Villain quickly bets $50 and while I think about he shows his hand to the guy next to him and says "ACE JACK" loud enough for me to hear him.
What would you guys do here?