A good question.

[ He leans back against the fence, spinning the daggers idly in his hands. ]

Daggers are small, brutal weapons. They are not designed for a clean encounter. They are designed to do terrible damage, quickly and efficiently. If you use it, you should have killing on your mind.

[ He tosses one dagger into the air, and catches it by the blade as it comes down. ]

Or severe injury, at the least.