Oh, so the floating spirit in the photo REALLY IS Nobunaga. And that guy, creepy as he is, must be a legit exorcist if he's able to drive away Nobunaga like that. Also, I don't think he has exorcised Nobunaga for good. I mean, past memory or not, Oda IS Nobunaga reincarnation. How do you exorcise a spirit when it has already been reborn? I think he was simply/accidentally driving away or sealing Nobunaga (memories) from Oda chan temporarily.