call this river bet?

[slowhand5]

POKERSTARS GAME #11281801769: OMAHA POT LIMIT ($0.25/$0.50) - 2007/08/03 - 00:57:47 (ET)
Table 'Pleione IV' 6-max Seat #1 is the button
Seat 1: Slowhand22 ($43.95 in chips)
Seat 2: Thoxx ($18.15 in chips)
Seat 3: Dragonbel ($207 in chips)
Seat 4: SilentAcorns ($32.75 in chips)
Thoxx: posts small blind $0.25
Dragonbel: posts big blind $0.50
Killer88 said, "lmao"
Killer88 said, "what a dumb play"
cashryders22: sits out
*** HOLE CARDS ***
Dealt to Slowhand22 [9h Tc 7s 9d]
SilentAcorns: folds
Killer88 said, "sure u get lucky all the time LOL"
Slowhand22: raises $1.25 to $1.75
Thoxx: folds
Killer88 leaves the table
Dragonbel: calls $1.25
*** FLOP *** [6d 9c 5s]
Dragonbel: checks
MrNyNe joins the table at seat #6
Slowhand22: bets $2.50
Dragonbel: calls $2.50
*** TURN *** [6d 9c 5s] [Kc]
Dragonbel: checks
Slowhand22: bets $8.35
Dragonbel: calls $8.35
*** RIVER *** [6d 9c 5s Kc] [Js]
Dragonbel: bets $24.20


The villain hasnt really gotten out of line and seems like a pretty solid player. I've been playing pretty agg so I'm pretty sure there is no way he puts me on a set. I really feel that he would of played 78 much more agg on the flop and turn. I would insta call this against an agg opponent but this guy has been playing pretty tight. thoughts?