Second hand at the table, no reads. Who fires again on the turn? How much?

Table Table 126400 (Real Money)
Seat 5 is the button
Total number of players : 6
Seat 1: R_AKM_74 ( $54.85 USD )
Seat 2: jay_playa1 ( $57.55 USD )
Seat 3: quinteroand ( $63.20 USD )
Seat 5: TBAYJIGGER ( $11.13 USD )
Seat 6: Trash321 ( $51.07 USD )
Seat 4: Semillon ( $50 USD )
Trash321 posts small blind [$0.25 USD].
R_AKM_74 posts big blind [$0.50 USD].
** Dealing down cards **
Dealt to Semillon [ 7h 8h ]
jay_playa1 folds
quinteroand calls [$0.50 USD]
Semillon raises [$2.50 USD]
TBAYJIGGER folds
Trash321 folds
R_AKM_74 folds
quinteroand calls [$2 USD]
** Dealing Flop ** [ 4s, 8s, 5h ]
quinteroand checks
Semillon bets [$5.50 USD]
quinteroand calls [$5.50 USD]
** Dealing Turn ** [ Jd ]
quinteroand checks
Semillon ???

Bet/fold and check behind on river. Giving up on t turn is not terrible but i see too many floaters nowdays for it to be the highest EV.