The burst of flame is something Lambert's seen before, though not in this particular blue and black combination, and not for a while -- not since the Celebration, where it felled vampires and left them inert. Childermass doesn't hit the floor because Lambert shifts his grip to catch him, but there's no time to check Childermass's vital signs. He's not moving and that means he's not going to the Count. That's enough, for now.

That doesn't fix the problem that without Elysium, there really isn't anything holding the other fae at bay anymore. There may be an order forthcoming from the Ringmaster, but Lambert, at least, knows exactly what the fuck he thinks they need to do.

"RUN!" While his bellow echoes through whatever part of the library they're in, he's swift to follow it with a more personal call, urgent and harried, for the other person here that he cares for the most-- "Peridot!"