villain had a short stack, doubled up 99 > AQ through me
I haven't seen him do anything retarded, but I assumed he was a fish because he was 32/19 with 0% 3b over 76 hands

Full Tilt No-Limit Hold'em, $2.00 BB (4 handed) - Full-Tilt Converter Tool from FlopTurnRiver.com

Button ($135.10)
Hero (SB) ($204)
BB ($460.40)
UTG ($200)

Preflop: Hero is SB with 8, 5
1 fold, UTG checks, Button calls $1, Hero checks

Flop: ($6) 5, J, 8 (3 players)
Button checks, Hero bets $5, UTG calls $5, Button raises to $16, Hero raises to $40, 1 fold, Button raises to $133.10 (All-In), Hero calls $93.10

Should I stacking off here always or just flat his raise and proceed cautiously?