As someone who lost the ability to sleep, Shinji can't get the time to be possessed by a remnant soul; also, his sickness doesn't let him get possessed. The instant he vanishes from the forest, he finds himself in a dark space; whether he is floating, or falling is unknown.
Despite the haunting state of the situation, Reverend Jazz knows better than to conjure a source of light.
—Under the guidance of the rabbit, pink shall fall into the 5 wings, and enter darkness, at first. If he casts a light, he shall be devoured by what he can't defeat. However, if he endures for a time and a half, he will drop into the clear waters, where his journey begins; but, if only the darkness doesn't make him insane with its grody sounds.
'With this prophecy, and my memory of chaos that doesn't forget, I feel like a regressor."
Shinji tries to joke to himself, inciting him to think of what Tabani told him about Valorn. His Tama to time travel can be considered regression.
