The Ender Dragon did not touch the book. Leaving it alone, the dragon flew away.
A breeze started to pick up. The book followed the wind. It finally fell off the End.
Drifting through space, the book floated for years and years before finally coming upon a gravitational field. It was pulled in and landed on hard bedrock. Mushrooms grew here and there on the rock, life in such a desolate place.
And the book knew. It knew it was on top of the Nether.