Beware the Batman

Katana:
What about Alfred?

Batman:
May not make it in time. My arm is loose. There are liquid nitrogen capsules on my belt. I can get to them, if I can chip away some of this stone.

Katana:
What good will that do?

Batman:
If heat hardens it, perhaps extreme cold will reverse the process.

Katana:
Really? That'll work?

Batman:
Could. Or maybe nothing happens. Or the reaction could cause the liquid stone to become so unstable it explodes.

Katana:
I'm going to keep my fingers crossed for Alfred.