[Closed] .5/1 J9s fold river?

Hand converted with online PokerStrategy.com hand converter:

Hand abspielen

$0.5/$1 Fixed-Limit Hold'em (6 handed)

Preflop: Hero is SB with 9:c, J:c.
2 folds, CO calls, BU calls, Hero calls, BB checks.

Flop: (4 SB) 2:s, 7:c, A:c (4 players)
Hero bets, BB calls, CO calls, BU raises, Hero calls, BB calls, CO calls.

Turn: (6 BB) 5:c (4 players)
Hero bets, BB calls, CO calls, BU calls.

River: (10 BB) 5:s (4 players)
Hero bets, BB raises, CO folds, BU 3-Bets, Hero calls, BB caps, BU calls, Hero calls.

Final Pot: 22 BB.

BB big fish 68/4/1,4/40 at 530 hands (-40bb/100 so far)
BU reg-tendencies 36/29/1,75/33 at 15 hands

i dont worry so much about the fish as he could just have a 5, BU however could have 22/77 which would be exactly how he played the hand, raise flop for protection, call 3-suited turn for FH outs, cap river for value with FH...

not sure but i think a fold to the BU-3bet should be viable.