"I doubt it was a bug," he says, relenting a little. "Not enough food out here for them to get that big. But if you want to avoid the bats we could always go higher. Or lower. Really low."

He gets a rather predatory look at this idea. They aren't quite as high as they'd been at the beginning of Crowley's dive, so if he really listens he can hear the creatures' calls all around them.