Bad bluff? $50NL 6-handed

$50 NL Texas Hold'em - Tuesday, September 06, 01:07:58 EDT 2005
Table Table 36863 (6 max) (Real Money)
Seat 3 is the button
Total number of players : 6
Seat 1: stk5c ( $52.20 )
Seat 2: barnstable ( $53.70 )
Seat 4: Grimstarr ( $49.88 )
Seat 5: bubbabad420 ( $67.66 )
Seat 3: viklee99 ( $65.77 )
Seat 6: draws_r_us ( $33.95 )
Grimstarr posts small blind [$0.25].
bubbabad420 posts big blind [$0.50].
barnstable posts big blind + dead [$0.75].
** Dealing down cards **
Dealt to Grimstarr [ 6h Ts ]
draws_r_us folds.
stk5c folds.
barnstable checks.
viklee99 folds.
Grimstarr calls [$0.25].
>You have options at Table 36835 (6 max) Table!.
bubbabad420 raises [$0.50].
barnstable calls [$0.50].
>You have options at Table 36835 (6 max) Table!.
Grimstarr calls [$0.50].
** Dealing Flop ** [ 5d, Jh, 2h ]
Grimstarr checks.
bubbabad420 checks.
barnstable checks.
** Dealing Turn ** [ 9s ]
Grimstarr bets [$2].
bubbabad420 calls [$2].
barnstable folds.
** Dealing River ** [ As ]
Grimstarr bets [$4].

pretty much just representing the ace....WWJD?