($24) Shorty in BB with J6o. Line check

[Pocketbear]

Full Tilt Poker
No Limit Holdem Tournament
Blinds: t80/t160
5 players
Converter

Stack sizes:
UTG: t7390
CO: t2510
Button: t2340
SB: t275
Hero: t985

Pre-flop: (5 players) Hero is BB with J[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/club.gif[/img]
UTG folds, CO calls t160 <font color="aaaaaa">(pot was t240)</font>, Button folds, <font color="#cc0000">SB raises all-in t275</font>, Hero calls t115 <font color="aaaaaa">(pot was t595)</font>, CO calls t115 <font color="aaaaaa">(pot was t710)</font>.

Flop: 6[img]/images/graemlins/spade.gif[/img] 3[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/spade.gif[/img] (t825, 2 players + 1 all-in - Main pot: t825)
<font color="#cc0000">Hero is all-in t710</font>.

CO has been limping quite often recently. Standard?