After re-trying I got it working but it extremely specific where the player is currently standing, not even being on-top of the book triggers. Also it is possible "skip" the mana mechanic at the book by spamming the interaction which still triggers regardless of mana(?)
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Thanks for giving it another shot. Yeah, unfortunately you can't stand on the book. Spamming it can make it go faster, but it stills uses the energy, but can be done about twice as fast. I didn't fix it, and a few other bugs, because I thought other things were more important and ran out of time. Will fix it up after the voting is over.