Firo steps back quickly, unsteady in the water until he finally hits dry ground. That's better.

And now that he has his footing, he decides he'll take a little risk. Maybe it'll freak this guy out--he doesn't like how his clothes often get ruined when he shows off his immortality, but it'd be worth it to scare this brat.

Though his knife is still in hand, he holds his arms out wide. He's completely open. "Why don't you try it? If you think you can. Do you even know how to use that thing?"