[Finn snorts, already in a better mood now that this nerd showed up.]

I thought you were all about staying inside and setting fire to stuff. It doesn't have to be cold for real to do that! [Though maybe the fire would make things too hot inside? Finn rubs his chin thoughtfully.] But... y'know, there's loads of ice in the kitchen...

[More chin rubbing. With alarming suddenness, Finn grins and jumps to his feet.]

You wait here, bro!

[He's running away now. Running away to Glob knows where. It seems like that's all the context Ryunosuke is going to get before Finn shouts back at him over his shoulder...]

Start a fire, dude! I'll be right back!