His arm would just end up freezing, Xo, like Shuri's katana did.
And check the art forum for BONUS INTERACTIVE TOU FUN, guys!

Before leaving, I looked closer at the red dot on the piece of scrapmetal. It looked like a built-in light, as though the metal was once part of an airplane wing. Or a wall with a red light on it. It was not glowing, therefore probably broken.
The rest of the pack was arriving just as I was turning to leave. "Follow," I ordered again, and they grudgingly turned back with me.
After an annoyingly long walk and one valve turn, we arrived at the dome. I dropped the two rocks onto the respective platforms. There was a short rumble of a motor starting, gears clicking, and the doors slowly slid open.

It was considerably warmer inside - no doubt due to the lack of wind.
The contents of the dome itself were rather strange. A few clocks and other trinkets lay scattered around, along with a few rocks (a spare set?). Most of all, everyone seemed happy to get in from the cold. Except Uberbob, who was no doubt about to pocket everything he could.