$55 PP What are they thinking?

[HoldingFolding]

I was reveiwing a bunch of HHs & came across this hand. What do you think they were thinking?

Party Poker
No Limit Holdem Tournament
Blinds: t200/t400
6 players
Converter

Stack sizes:
Hero: t3440
UTG+1: t3230
CO: t3600
Button: t2890
SB: t2360
BB: t4480

Pre-flop: (6 players) Hero is UTG with 5[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/heart.gif[/img]
Hero folds, 3 folds, SB calls t200 <font color="aaaaaa">(pot was t600)</font>, BB checks.

Flop: A[img]/images/graemlins/club.gif[/img] T[img]/images/graemlins/spade.gif[/img] 4[img]/images/graemlins/heart.gif[/img] (t800, 2 players)
SB checks, <font color="#cc0000">BB bets t800</font>, <font color="#cc0000">SB raises all-in t1960</font>, BB calls t1160 <font color="aaaaaa">(pot was t3560)</font>.

Turn: J[img]/images/graemlins/club.gif[/img] (t4720, 1 player + 1 all-in - Main pot: t4720)


River: Q[img]/images/graemlins/club.gif[/img] (t4720, 1 player + 1 all-in - Main pot: t4720)


Results:
Final pot: t4720
<font color="#ffffff">BB shows 4c 9c </font>
<font color="#ffffff">SB shows Jd 9h </font>