Bringing that particular topic gets Glacius to tense again as a sound that's part whine, part growl slips up out of his throat. But this talk has contextualized some things for him—namely the fact that they can't hold each other back from their respective callings, and his repeatedly emphasized desire to help his partner with his troubles—so when he speaks again, there's less stonewalling and... more unguarded concern, perhaps allowing them to strike at the heart of the matter.

"But this is different than anything you've tried to heal or cleanse before, you just said it yourself. We... we don't know what could happen and... I'm supposed to keep you safe. What if I let you do this and it goes terribly?" the ice alien laments, tightening his grip on his partner as if to physically emphasize his next thought, the crux of the issue: "I... I don't want to let you go."

And from the way that Glacius says that, it is very apparent that he doesn't mean going to Roise, or to this task—but that he doesn't want to let Carlisle go in the truest sense of the word, that he doesn't want to lose him.