Togusa nods in understanding. "That's- that's what happens, yeah. If Ryuuzaki never remembered it, then there's no way you'd know it. I'd never thought that eventually you could get a condition of the other soul, too." LIE. A dirty and absolute lie. It's precisely the fear that Togusa has for Koutarou, that one day his best friend would wake up with the kind of cognitive degeneration he's described the other version of Koutarou having.

So seeing Tatsuo exhibiting something similar? It's as sharply terrifying as anything else in this room. But he doesn't dare try to deny it. Togusa abruptly notices that he is breathing a little harder, his heart is clenched. Get it together.

"You aren't supposed to be here at all." Slowly, Togusa can focus on that fact again.