figures out who he is even though 'he' was gone

“I am Kamijou Touma. I am no one but Kamijou Touma!!”
As soon as he spoke, Othinus grimaced in utter displeasure.
This expression clearly held more danger than any other she had given.
She had lost interest. With a girl who had risen to the position of a god, that fact had to be
accompanied by great fury.
Finally, she clicked her tongue loudly and sighed.
“When did you catch on?”
“…”
“Don’t tell me this is more baseless confidence or optimism not far removed from not
thinking at all.”
“I had a hint,” he answered quietly. “You gave me a hint.”
“I did?”
“If your goal was nothing more than making me suffer, you would never have given me
that class photo. That meant you had a reason to show it to me. Isn’t that right?”
“…I see.”
“You said the real me was in there, but you never warned me that it was someone other
than Kamijou Touma. You were hoping to see me choose wrong when I could have easily
chosen correctly.”
Also, she had said there was no point in creating a new “Kamijou Touma” and tormenting
him.
If she saw no meaning in setting up someone else as “Kamijou”, the one she was torturing
had to be the real one.
“So you saw through my malice. And here I thought it would be an interesting experiment
in destroying your identity.”
“I don’t know how, but you wrote on the blackboard, pulled out that photo, and set up
other tricks without using your hands. If I had given another name, you could have simply
applauded and praised me. You could create as much false evidence as you needed to
prove I had chosen correctly.”
As if interrupting or as if standing up from a theatre seat while watching a boring comedy,
Othinus snapped her fingers.

- New Testament Volume 9 Chapter 6 Part 8