She probably thought that Samuelson and the Soul-stealing Wizard had escaped or were hiding somewhere.
However, the items Noland took out of the Magic Pouch refuted Mabel's guess, which led to the current situation.
Noland timely interjected:
"Mabel, I saw two charred piles of ash in the Grand Hall of the Spire. Those should be the remains of Samuelson and the Soul-stealing Messenger. Would you like to go and see?"
Mabel immediately stated that she wanted to verify the situation.
She flew away on her magic broom, leaving Noland to guard the relics in the corridor.
Seizing the opportunity, Noland cast Deconstruction at the magic books Gardner was carrying.
Just like when deconstructing "Night Mother's Apples," he first consumed about 10,000 energy points to deconstruct the magic lock, after which he consumed another 30,000 energy points to harmlessly deconstruct the book's content.