Well, it wouldn't have been a completely terrible idea, even if had been reckless. That outcome, though, now that's something that Childermass can offer an explanation for. Something that had even faded from his own memories, right up until the Count commanded him in Elysium.

"It's a bloodbond," he supplies that awful little word for Steven, "Because you're of her blood, not just some changeling. If she can see you, she can command you. It's... the same. Between the Count and myself."