"Well," Abby says, a little nonplussed (it's only what it says on the tin there, John), "Basically you pick someone, and stick with them. It's how we typically operate around here. Nobody goes off alone to do anything, just in case."

Including her, including Ellie. Mistakes can happen anywhere, to anyone. At any given time. "We might end up pairing you all off ourselves," she admits, "Depending on experience, and ability. But for now, it'll work best if you know who to stick beside in case we get split up for any reason."