Cheung 1 and 2 stopped chattering. They looked at one another. Then, they burst out laughing.
Cheung 1: "Hahahaha! That's awesome! You can make heads explode?!"
Cheung 2: "Thats way cooler than duplication!"
Cheung 1: "Well, I wouldn't go THAT far."
Cheung 2: "Yeah, you're right."
They looked at eachother and silently shared thoughts. 
Cheung 1: "Well, it's been [i]GREAT[/i] talking to you."
Cheung 2: "But we're off to go meet some of the other prisoners."
Cheung 1 and 2: "Byebye!"

They started walking in the direction towards the girl who was scorching the wall with her fingers.
Cheung 1: "Hey!"
Cheung 2: "Girl who is scorching the wall!"