20/40 vs Maniac and some guy playalong

[Piiop]

Party 20/40 Full 10-handed. I've been playing for awhile and the table is especially amazing cuz it's 6:30 am EST. A random guy joins and sits on my immediate right (he's a nice guy) and proceeds to go crazy. His stats are 72/34/1.1 after about 40 hands. He gets passive on the turn/river but he's pretty wild pre and on the flop. Unfortunately, I've been very card dead basically the whole time and haven't really been playing at all. The CO's stats are 22/14/2 over 800 hands and I know him only from datamining and this session. His ASB is 49%.

I have A [img]/images/graemlins/diamond.gif[/img]Q [img]/images/graemlins/club.gif[/img]

Preflop: Folded to the CO who open raises, button folds, SB (maniac) 3-bets, I cap it, both call.

Flop (12sb): T [img]/images/graemlins/spade.gif[/img] 9 [img]/images/graemlins/club.gif[/img] 4 [img]/images/graemlins/spade.gif[/img]

Maniac bets, I do what?