Oh, sure. Except maybe paint or something-- I bet someone could have a lot of fun with that. Non-toxic, obviously.

[ Though that could also be more trouble than it's worth, too; messy as hell, for one thing. Reggie will just put a pin in that idea for later. He chews his burger thoughtfully, then asks: ]

What's even the point of a duel in the dark? I mean you're still gonna know where you both are if your weapons glow, right? [ He takes another bite, chewing slowly. ] So can I see it?