It was general standard procedure for Don to not get involved in his brothers' tiffs. Ever. In fact, he tended to go the opposite direction and wait it out - with some fine helping of eye-rolling and exasperation - in a corner somewhere.

He swings his staff to point it first at Raph. "He is injured," and next Mikey, "and you. Are injured. Did that somehow slip your mind, because I thought it was obvious, Mikey, that-"

Don pauses, and glances down.

"Did you climb up here."