It was a quirk he was under right? If so it’s probably an illusion of him going into the past as himself considering that his past self isn’t there in the video.
One thing that stands out for this anime and a few of my other fave animes is that it can include a LOT of comedy but then it gets really dark and like sad but I suppose you could just call it 'balance'
Kohei I'm begging you please let Deku return to UA its much dangerous for him to be facing villains on his own, having a powerful quirk or not because we all villains that even Deku can't defeat
I dint know why but... This etape for the manga remaind me tokyo goul... Literraly Kaneki throw away everithyng to be a failed hero and then came back sou I hope Izuku came back too ;~;