He is riding on the back of the eagle owl that he has seen earlier. Apparently the eagle owl is going to Riddle Manor and then Harry's perspective leaves the owl's back. He can see the owl, too, as well as the back of the chair with that thing in it, that thing that Harry has never seen head on: that small, baby-shaped, scary thing. So yeah, he's having a vision. For full show notes, transcripts, ways to contact the hosts or support the show, and more, visit hpafter2020.com.