Am I the only one who gets the idea the Deceiver likes being frozen in the glacier? I know it's just comic relief--but that zerk really mangles the incantation. I was under the impression you need to get spells just right or they backfire on you. The Jman is pretty serious about making sure he has it right. The zerk more or less spouts random words and waves the sceptre around like a claymore. This should have no effect at all--or if anything, it should kill the zerk, right? But the Deceiver sits right up and says "close enough", as if he'd been waiting for this and just wanted to make sure the zerk wasn't an enemy. It's more like a password than an incantation.
The upshot: the Deceiver could have gotten out of there any time he wanted to. Once again, he has his own agenda--getting revenge on the old school Fallen--and this time you're just lucky enough that it jibes with your plans.