correct laydown?

[SuperSnort]

i timed out in this hand. put him on flush draw like me but when he bet out he bet quick.

Full Tilt Poker Game #3851888006: Table Irwin (6 max) - $2/$4 - Pot Limit Omaha Hi - 10:55:48 ET - 2007/10/14
Seat 1: leviathon1212 ($162.20)
Seat 2: Brittsgirl78 ($214.80)
Seat 3: bigdaddy9019 ($310.30)
Seat 4: tutterio ($277.80)
Seat 5: electra ($380)
Seat 6: Snort4eva ($441.50)
Brittsgirl78 posts the small blind of $2
bigdaddy9019 posts the big blind of $4
The button is in seat #1
*** HOLE CARDS ***
Dealt to Snort4eva [9s Ac Kh 4c]
tutterio calls $4
electra folds
Snort4eva raises to $16
leviathon1212 folds
Brittsgirl78 folds
bigdaddy9019 calls $12
tutterio has 15 seconds left to act
tutterio folds
*** FLOP *** [5c 2s 9c]
bigdaddy9019 checks
Snort4eva bets $38
bigdaddy9019 calls $38
*** TURN *** [5c 2s 9c] [Ad]
bigdaddy9019 checks
Snort4eva bets $100
bigdaddy9019 has 15 seconds left to act
bigdaddy9019 calls $100
*** RIVER *** [5c 2s 9c Ad] [8h]
bigdaddy9019 bets $156.30, and is all in
Snort4eva has 15 seconds left to act
Snort4eva has requested TIME
Snort4eva adds $112.50
Snort4eva folds
Uncalled bet of $156.30 returned to bigdaddy9019
bigdaddy9019 mucks
bigdaddy9019 wins the pot ($311)
*** SUMMARY ***
Total pot $314 | Rake $3
Board: [5c 2s 9c Ad 8h]
Seat 1: leviathon1212 (button) didn't bet (folded)
Seat 2: Brittsgirl78 (small blind) folded before the Flop
Seat 3: bigdaddy9019 (big blind) collected ($311), mucked
Seat 4: tutterio folded before the Flop
Seat 5: electra didn't bet (folded)
Seat 6: Snort4eva folded on the River

[TheRempel]

HU unless he's a big nit on the river you have to call. He only has to be bluffing about 28% of the time for the call to be +EV.

[Poker monkey]

28% is quite often though? Seems to be more of an argument for a fold... "he has to be bluffing more than 28% of the time for this call to be +EV".