"Well, I normally don't like to pry, but--" Glacius head cocks up slightly as the flame goes out, and he exhales ever so slightly in relief, "--But I was never expecting this--it is a very particular power, and the last person I encountered who could so something similar was a dangerous being, formed from having his DNA aletred..."

.. And he's doing it again, isn't he? He's letting past experiences color his perceptions--this time not just of someone he's meeting for the first time, but of someone has proved herself to be perfectly reasonable and even helpful on occasion. Now that the immediate threat that he feels from the fire is gone, Glacius has a chance to take in Rey's confusion and her completely nonthreatening posture.. though her explanation is not heartening--though Cinder was born a human, the fiery being he became was technically created artificially, wasn't he?--he is beginning to feel bad for the assumptions his mind leapt to.

The alien straightens up immediately, trying to force himself to relax. "I'm sorry. You are just the first humanoid that I have seen with that ability since I was imprisoned and forced to fight for my life. It sparked a bad memory... but I should not have let take hold."