Quote from Michael in Tinker, Tailor, Demon, Spy
Jason: So does blowing up mean he was telling the truth or lying? Janet: Neither. That was not supposed to happen. I've never killed anybody before. Michael: No, don't worry. Demons can't die. He'll slowly reform himself over a few months, passing through all the stages of demon growth: larva, slug monster, spooky little girl, teenage boy, giant ball of tongues, social media CEO, and then finally demon, so... Look at the bright side. This worked out perfectly. I mean, not for Glenn, obviously, but for us. Lying demon's gone. We're still here. All good.