Prima, $0.25/$0.50 No Limit Hold'em Cash, 2 Players
SB: $57.07 (114.1 bb)
Hero (BB): $51.48 (103 bb)
Preflop: Hero is BB with A

A

SB completes,
Hero raises to $2.50, SB calls $2
Flop: ($5) 6

8

J
(2 players)
Hero bets $4, SB calls $4
Turn: ($13) T
(2 players)
Hero bets $9, SB calls $9
River: ($31) 5
(2 players)
Hero bets $12,
SB raises to $41.57 and is all-in,
Hero folds
Anon table.
Opponent was unknown, but on small sample looked fishy.
Ch/fold river? Or smaller blockbet, like 10$?