Do you call an all-in for nearly half your stack on a draw?

[maddo]

$10 3-Table MTT

You're in the BB. No reads.

PokerStars No-Limit Hold'em Tourney, Big Blind is t30 (7 handed) converter

CO (t960)
Button (t2310)
SB (t1210)
BB (t2590)
UTG (t1700)
MP1 (t2280)
MP2 (t1270)

BB is dealt: A[img]/images/graemlins/spade.gif[/img] 7[img]/images/graemlins/spade.gif[/img]

Preflop:
<font color="#666666">1 fold</font>, MP1 calls t30, MP2 calls t30, <font color="#666666">1 fold</font>, Button calls t30, SB completes, BB checks.

Flop: (t150) 4[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, <font color="#CC3333">BB bets t60</font>, MP1 calls t60, MP2 calls t60, Button calls t60, <font color="#CC3333">SB raises to t1180</font>.

Do you call the SB's check-raise all-in for almost half of your stack getting less than 6-4 on your money? Are you concerned about players behing you? What do you put the SB on?