User blog comment:SethOmega/Bracchidios Discussion/@comment-4695408-20111227181930/@comment-69.31.252.185-20120606000259

I assumed it worked with heat because when Agna starts up his beam, the sludge lights up instantly. I figured normal Brach kept it cool on his body somehow. Plus an angry Brach would have a higher body heat, but that doesn't make any sense in the tundra, because the slime would definitely just freeze or instantly gel up.