Integra: Who could have done this?
Alucard: I sensed no one sneaking onto the grounds, Master.
And it’s a largely unknown method of subduing a vampire. We’re dealing with an expert.
Integra: A very strong, or subtle, expert.
Integra: What is it, Walter?
Walter: If I may…before we panic, there is a far simpler explanation which we ought to look into.