Glacius blinks down at Carlisle as he digests that knowledge. If that was his double's plan, then what made him decide to go off of it? Why had he favored the emotional torment over the physical? Perhaps he was simply attempting to grind down the ice alien's will before he attempted the compulsion--it would have been extremely difficult otherwise...

"Well... he didn't," the ice alien murmurs, glad to see the Spire looming large in the distance. All that twitching and shaking the clergyman is doing is making him nervous... he needs to tend to him. "Either he simply didn't get the chance, or he decided other tactics would be more destructive in the long run."

And given how it's a true challenge for the alien to not reveal how utterly eviscerated he's been feeling over everything, it seems like that was a safe assumption.