Panel 1: Batman is just about to open the door to a warehouse in Gotham's warehouse district, and is talking to Oracle over a radio transmitter in his cowl.
Batman: BARBARA, I THINK I'VE NARROWED DOWN THE VENTRILOQUIST'S HIDEOUT. THIS SHOULD BE A WALK IN THE-
Panel 2: Batman has opened the door and is reacting in surprise.
Oracle: BRUCE? BRUCE?
Panel 3: We see what Batman is reacting to, a warehouse full of discarded, decrepit mannequins, with the Ventriloquist sitting on a throne made of mannequin parts, Scarface on his knee. Ventriloquist is staring blankly ahead.
Batman(whispering):BARBARA, GET NIGHTWING AND ROBIN OVER HERE FAST.
Panel 4: Same viewpoint as P3, but the mannequins are beginning to get up, and are looking towards Batman. The Ventriloquist's voice is coming out of different mannequins in different parts of the warehouse, and the speech bubbles should reflect that.
Panel 5: Batman is overwhelmed by the mannequins, who are taking off his utility belt and restraining him.
Panel 6: Close up on The Ventriloquist in his throne, Scarface on his knee. The Ventriloquist's voice still doesn't come out of his mouth, but out of a mannequin head integrated into the throne
Ventriloquist: DON'T YOU LIKE THE NEW ADDITIONS TO MY ACT, GATMAN? EVEN SCARFACE HERE LIKES THEM.
Scarface: YEAH, THIS MUG ACTUALLY DID SOMETHING GOOD FER ONCE, AN GOT ME A GANG TO TAKE OVER GOTHAM WIT.
Ventriloquist: THOUSANDS OF WALKING DOLLS, ALL WITH MY VOICE... MY WILL... MY MIND.