Yeah, I guess it would be once you figured out how to make the trap.

[He'd done some hunting, but never bothered trying to trap things. He didn't really have much to do kill time as he waited on them.]

Noise traps? Nice. That sounds pretty useful.

[Levi himself wasn't so good with loud noises though, for reasons he didn't really understand.]

Keeps someone from sneaking up on you and trying to take you to school or home. Heh.