I raise w/ A8 in lp to 20, losse-passive station calls out of blinds.
flop: 5-5-8 (rainbow). he checks, I check for pot-control. reasonable?
turn: 2. he bets 40, I call.
river K: he goes all-in 1/2 pot.

hero?

villain is loose-passive station.
never saw him bluff, except once he took a stab on flop when checked to but gave up later.