Vanessa still can't say for certain if the Child can or cannot control his abilities, but there's little point in arguing pure conjecture. Everything that Clara notes on speaks to a menace that has previously occurred to Vanessa, but there is something quite off about such a thought after tonight.

"Too, I worried over his possible manipulations of the Child, but...consider what just happened. He compelled us as if it were nothing. If he has such an ability, then I doubt he would need to go to so much trouble merely to dress up a sacrificial lamb."

Which isn't to say it can't be that and something more, but Vanessa is still undecided upon the role that the man in white is meant to play in this realm.