What happened when Jayfeather was with Half Moon and the Ancient tribe cats. Was he dreaming, of having a vision, of going back in time?

I think he was dreaming, but it's been a while since I read that book. Either he was dreaming, of having a vision. But he definitely wasn't traveling back in time.

I think he was going back in time IN A DREAM. I have to say that is my favoriete book.

he goes back in time