Cassandra catches Natsuno's gaze as he comes down the corridor, and beckons him close enough to speak in an undertone, for his ears only.

"This may not matter now, but ... do you have any idea who used the string? We'd thought it was gone, when Tayrey was."

Does she have any guess, any suspicions? Maybe. She hasn't forgotten that most of the team discussing it had been opposed to using the string -- some unwilling to see it used at all, some insisting on gathering more information first. And she remembers who was and wasn't at that meeting.