Why not both?

The book was real. It had to be. There's no way that was just an accident, and Ruby was way too innocent to just flash him normally.

Jaune, for the first time in his life, felt... strong. This book had given him some kind of control. Some kind of power.

And there were so many hot girls available to him in Beacon.

The girls from team RWBY began to walk past him on their way to the cafeteria. Jaune knew this was the perfect chance to get one of them alone to do further testing. He knew he could make Ruby do something simple, like flash. But what other options were there?

Could he change their personalities? Change their goals? Undo changes? Add things like triggers? Go further than just flashing? He had to know.

Jaune quickly jotted down one of their names in the book, followed by "will make an excuse to go to the nearest unoccupied room, then strip naked, unaware of Jaune's presence"

Jaune made his way to the nearest empty room, being one of the classrooms.

Then he just... waited.