How did two 2p2ers play this hand?

[PartyGirlUK]

Party Poker 20/40 Hold'em (9 handed)

Both twoplustwoers know each, know that maniac is a maniac pre-flop stupid but mildly aggro postflop, both know who each other is, both know that the other knows that the maniac is a maniac etc.

Party Poker 20/40 Hold'em (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: <font color="#666666">1 fold</font>, <font color="#CC3333">Maniac / raises</font>, <font color="#CC3333">Bill 3-bets</font>, <font color="#666666">4 folds</font>, <font color="#CC3333">Ben/ caps</font>, <font color="#666666">1 fold</font>, UTG+1 :#A500AF(Maniac)/ calls, Bill calls.

Flop: (13 SB) 7[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Ben bets</font>, Maniac calls, Bill calls.

Turn: (8 BB) 3[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
Ben checks, Maniac checks, Bill checks.

River: (8 BB) 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Ben bets</font>, Maniac calls, <font color="#CC3333">Bill raises</font>, Ben calls, Maniac folds.

Final Pot: 13 BB

Results in white below:
Ben has 6d 6h (three of a kind, sixes).
Bill has Kc Jc (flush, king high).
Outcome: Bill wins 13 BB.