NL5/10 Fold flush to massive shove on river?

[vixticator]

I'm tracking SB on two tables, haven't seen anything like this from them before through 150+ hands. 40/10/2 type. What's going on here? I folded FWIW.

Poker Stars - No Limit Hold'em Cash Game - $0.02/$0.05 Blinds - 4 Players - (LegoPoker HH Converter (http://www.legopoker.com/hh))

SB: $8.36
Hero (BB): $13.28
UTG: $3.96
BTN: $2.87

Preflop: Hero is dealt 4/images/graemlins/club.gif T/images/graemlins/club.gif (4 Players)
UTG folds, BTN calls $0.05, SB calls $0.03, Hero checks

Flop: ($0.15) 3/images/graemlins/diamond.gif 5/images/graemlins/club.gif 2/images/graemlins/club.gif (3 Players)
<font color="red">SB bets $0.05</font>, Hero calls $0.05, BTN calls $0.05

Turn: ($0.30) K/images/graemlins/diamond.gif (3 Players)
SB checks, Hero checks, <font color="red">BTN bets $0.10</font>, <font color="red">SB raises to $0.20</font>, Hero calls $0.20, BTN calls $0.10

River: ($0.90) 6/images/graemlins/club.gif (3 Players)
<font color="red">SB bets all-in for $8.06</font>, Hero WTF?

[Archon_Wing]

Raise this flop-- pretend that little bet doesn't exist. And call the river and cry when he shows a higher flush or laugh when he shows some straight. I'd imagine you'd laugh more. IMO, you should almost never fold a 2 card flush when there's a straight possibility on board (assuming board isn't paired of course) as donks tend to chase gutshots or whatnot.