Lambert doesn't visibly seem perturbed by the revelation, just considers it, weighs it against the information he knows, and accepts it as fact. Yeah, that roughly explains the level of screwed they are, but on the other hand...

They're still here, not talking, not directly vaporized. It doesn't really answer what the Count wants out of them, but...

"Maybe the Great Beast got fed up of being treated like one," he pauses. "What'd she do to Summer?"

Might as well try for straight answers, if the Count feels like giving them.