You volunteered to accompany Donatello on his expedition to the mystic library (which he's still banned from but he makes it work). He hypothesizes that there are books on energy gems and crystals which he could experiment with to see if it could ever power his tech. It's not uranium and mystic and magic isn't his thing but he was suddenly willing to give it a try after you suggested it. So here you both are, wandering around the mystical maze of shelves while Donnie freestyle raps about the path and location on where he's desired piece of literature is.

"Loom 16, take corridor B..." He looks to you expectantly to continue his rhyme.