What would you do to entertain yourself?

I think they could have create a ball out of their cloth. Like his t-shirt. They could tie it up to resemble round ball and toss to each other, playing football, volleyball or catching it.

They should have try to break the gun. Like so something with bullets. Try to open them and flash out powder. Or flash bullets to toilet. Because it was obvious a psychological attempt to made them shoot each other. Bullets should have been out of the gun immediately so that no one would try to shout someone in a moment of distress.

And he should have draw cats, dogs, city, buildings... Something to lay your eyes on while bored. When its small details you can watch then over and over. Instead he draw some big boring face with hair and used all pencil on it.