They were with him when he took the book with the Auryn symbol on the cover in which he's reading his own story right now.
13 seconds sound clip from the The NeverEnding Story (1984) movie soundboard.
You can hear this line at 01:23:57 in the Blu-ray version of the movie.
Quote context
[...]
- He doesn't realize he's already part of The Neverending Story.
- The Neverending Story? What's that?
- Just as he is sharing all your adventures, others are sharing his.
- They were with him when he hid from the boys in the bookstore.
- I can't believe it. They can't be talking about me.
- What will happen if he doesn't appear?
- Then our world will disappear. And so will I.
- How could he let that happen?
- He doesn't understand that he's the one who has the power to stop it.
- He simply can't imagine that one little boy could be that important.
[...]