~$100 SNG 88, continue when A comes? Fold turn after I checked?

[PokerAmateur4]

Seat 1: siroyea321 (2,970)
Seat 2: Tmos 14 (1,380)
Seat 3: djmonkey (3,215)
Seat 5: zoerac (1,515)
Seat 6: GOLDDRAGON86 (1,415)
Seat 7: jensaaaaa (1,435)
Seat 8: Hero (1,570)
djmonkey posts the small blind of 25
zoerac posts the big blind of 50
The button is in seat #2
*** HOLE CARDS ***
Dealt to Hero [8h 8c]
GOLDDRAGON86 folds
jensaaaaa folds
Hero raises to 200
siroyea321 folds
Tmos 14 folds
djmonkey calls 175
zoerac folds
*** FLOP *** [As 3s 5d]
djmonkey checks
Hero has 15 seconds left to act
Hero checks
*** TURN *** [As 3s 5d] [4d]
djmonkey bets 250
Hero..