"I could possibly do that," ctsv says, haughtily, as if it were never in question. He's about to add that he could probably sneak up on Toph (and, according to himself, totally did!!) before he realizes that might be unnecessarily rude, at this point.

He does give Toph's suggestion a little further thought.

"So I could..." ctsv taps a knee. "...sneak up on people, and then stab them?"