Dustin reacts with a similar level of surprise - a shout and a stagger backwards, though thankfully he's able to pinwheel and keep his footing before he goes ass-first into a snowdrift. It takes a couple moments after that of instinctive, confused panic before his heart slows and logic kicks in.

Then he's just annoyed. "Fuck's sake," Dustin murmurs through a sigh, straightening upright while his expression flattens. Then he clears his throat so he can let his voice carry again. "Relax - I'm unarmed."

That's...well, mostly true. Dustin frowns, thinks for a second and amends, "--Okay, I have a leatherworking knife, but I'm not interested in trying to stab you with it."