Attempted float in 3r - Could have played it differantly?

[Syphonia]

Blinds 200/400 in the 3r, im pretty sure the guy doesnt have an ace and also pretty sure he is capable of laying down JJ/QQ/KK from what i've seen. i have a tight image and have only shown down big hands. what do you think? did i play this wrong? could i have done something differant and forced a fold or was he just not capable of the laydown?

PokerStars Game #13525620026: Tournament #68180118, $3.00+$0.30 Hold'em No Limit - Level VIII (200/400) - 2007/11/28 - 16:09:08 (ET)
Table '68180118 119' 9-max Seat #4 is the button
Seat 1: joejoe1337 (12890 in chips)
Seat 2: hairace68 (5478 in chips)
Seat 3: putterino (6896 in chips)
Seat 4: Syphonia (26567 in chips)
Seat 5: MartinGlad (23870 in chips)
Seat 6: Prieure (5135 in chips)
Seat 7: Tobias00002 (15850 in chips)
Seat 8: dgbryan05 (21499 in chips)
Seat 9: Itchy (26915 in chips)
joejoe1337: posts the ante 25
hairace68: posts the ante 25
putterino: posts the ante 25
Syphonia: posts the ante 25
MartinGlad: posts the ante 25
Prieure: posts the ante 25
Tobias00002: posts the ante 25
dgbryan05: posts the ante 25
Itchy: posts the ante 25
MartinGlad: posts small blind 200
Prieure: posts big blind 400
*** HOLE CARDS ***
Dealt to Syphonia [5h 5s]
Tobias00002: calls 400
dgbryan05: raises 1200 to 1600
Itchy: folds
joejoe1337: folds
hairace68: folds
putterino: folds
Syphonia: calls 1600
MartinGlad: folds
Prieure: folds
Tobias00002: folds
*** FLOP *** [As Ad 6s]
dgbryan05: bets 1800
MartinGlad is sitting out
Syphonia: calls 1800
*** TURN *** [As Ad 6s] [Ts]
dgbryan05: checks
Syphonia: bets 4025
dgbryan05: calls 4025
*** RIVER *** [As Ad 6s Ts] [8d]
dgbryan05: checks
MartinGlad is connected
MartinGlad has returned
Syphonia: bets 8000
dgbryan05: calls 8000
*** SHOW DOWN ***
Syphonia: shows [5h 5s] (two pair, Aces and Fives)
dgbryan05: shows [Jh Jc] (two pair, Aces and Jacks)
dgbryan05 collected 32075 from pot