Hand converted with online PokerStrategy.com hand converter:
$25/$50 No-Limit Hold'em (7 handed)
Known players:
[tg]CO$1450.00:///////;BU$1545.00:///////;SB$1105.00:///////;BB (Hero)$1171.00:///////;MP1$3185.00:///////;MP2$1156.00:///////;MP3$3888.00:///////;[/tg]
Preflop: Hero is BB with Q:c, 7:c.
5 folds, SB raises to $100.00, Hero calls $50.00.
Flop: ($200) J:s, 8:c, J:d (2 players)
SB bets $500.00, Hero raises to $1,071.00(All-In), SB folds, Hero gets uncalled bet back.
Final Pot: $700.
I know it's early, but i believe he didn't consider his stack before making that bet, and if that flop hit him in any way he would not bet it, at least not by that amount.