[The melodramatic sarcasm certainly isn't making Beck any more popular in Otto's book. He'll just pretend he didn't hear it, nor see it. Down to business, that'll be easier for the both of them in the long run.]

They're a conduit, and they also double as containment in a way. Once you begin the process of sapping energy, the prey should become too weakened to flee. [He scrunches his eyes shut for a moment, knowing damn well they're talking about living human beings here.] I don't believe it's possible to sap energy when your target isn't standing inside a circle of your own making, so yes. Without them, you'll find yourself in trouble.