OMCOM is sneaky

Yesterday, I explained how, in the middle of Rome's Revolution, OMCOM had hypnotized Rei. However, I fessed up to the fact that I had no idea what it was the OMCOM was up to. I should have had a hint, though. Here is the remainder of that scene, when Rei came out of it:

     The tremblor caused Rei to be awakened from his trance.
     “Rei?” OMCOM asked, “Are you awake now?” The lights went out and the room was plunged into complete darkness. OMCOM then slid open the door and allowed some of the red ambient light to seep in.
     Rei shook his head.
     “Why’d you stop it?” he asked plaintively. “I, I, what happened?” Rei asked, his voice returning to normal.
     “Your speech patterns indicated you had entered an altered mental state. I tried several times to awaken you but you resisted my suggestions. Where did you go?”
     Rei took a deep breath. “I don’t know. It was just so beautiful. That’s, that’s amazing, OMCOM.”
     “Do you recall hearing anything that I said to you?” OMCOM asked.
     “I heard your voice,” Rei said, “that’s about it.”
     “Perhaps someday it will come back to you. In the mean time, you should probably not remain here any longer,” OMCOM said. He turned the red light up outside the doorway even brighter. “I think you should join Rome now.”
     For some reason, Rei’s heart sank. He took a deep breath and left the permanent storage room.

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OMCOM snuck in one sentence that told you he was up to something. He said "perhaps someday it will come back to you". The only possible way to interpret that statement is what came to pass. OMCOM had implanted some post-hypnotic suggestions in Rei's brains. We only heard one. The one Rome triggered by uttering the phrase 'blue crystal reader'. I wonder what else he put in there. He still hasn't told me. Maybe he never will.