[The Doctor nodded gratefully and turned back to the phone, speaking rapidly.]

"Did you get that, Setsuna? Well, probably not... but I can prove he's here, honestly! He just told me about how when you first joined Celestial Being he used to help you calm down from nightmares that you had. Only then when he tried to hug you the next day you used to give him an elbow in the gut, right? Come on, how else would I know that unless he'd just told me, hmm?"