The journey to Egaroth had been one filled with discovery, learning, hellish learning, till he well, finally arrived.
Throughout that journey, the one thing Seth had was awareness, though he wasn't in control, he knew what was happening around him, and though at a time he lost his memories of something that had happened there, in the end, he still got them back.
Now it was time for him to make a return journey, and though there were a lot of unplanned surprises in the events before he entered the black portal, that his mind would suddenly go heavy till he near blacked out wasn't something Seth had expected when he entered spinning black mass.
To Seth, he felt like his body seized to exist for a few seconds, leaving just his mind floating in total darkness, and then the next second, he began feeling himself, everything about his body recovering from it where it had left off when he entered the portal.