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The Mysterious Man wasn't happy that one of his curses had been discovered, and then removed, so soon, therefore it didn't take him long to find a book he was looking for to hopefully deal with that. Quickly disguising himself as a student, and placing an extra spell on himself so that he couldn't be detected by the other-worlders, he headed off to the school, his magical pouch disguised as a schoolbag.
Seconds later a young man walked out of an otherwise empty bathroom and started roaming the halls. He placed a curse on a spatula he found in a locker, another on a pineapple he found sitting in an office. Soon he found what he was looking for: a locker that he could detect the aura of an other-worlder from. It took him a moment, but he realized that there were THREE lockers with traces of auras coming from them, not just one. He almost missed the third, either the original aura was very weak or there was something blocking it. Perhaps both.
The man knew that there had been two separate entrances of outer-worlders, one weak initial outer-worlder, and then two stronger ones. He figured that the weak one was biding its time, regaining its strength, and the other two were searching for it. Therefore, the outer-worlder that had removed his curses had to be using one of the two stronger lockers. A quick magical check showed which locker he was looking for, and he pulled out his book. After placing a curse he decided to play it safe, and cast another curse at the other stronger aura locker.
Soon the young boy had walked back into an empty bathroom, having left a cursed children's book on a teacher's desk, wondering why a child had been teaching the class, and vanished back to his world. Removing his disguise he picked up the book from earlier once more. It was about time he read the exact effects of the curses he had just placed. He had gotten about as far as them aligning with the target aura and therefore getting past defenses and detection, and then had decided to hurry up so he wouldn't be detected.
It didn't take him long to figure out that Emeral, who he currently only thought of as "the girl", would be thrown five minutes out of sync with the dimension time-wise as long as she was wearing the shoes he had cursed in her locker. Joe, who he currently only thought of as "the boy", would have gravity randomly increase and decrease with every step he took while wearing the shoes. Once the shoes were off of either of them their effects would wear off and they would return to normal conditions.
The Man snickered as he thought of what havoc this might cause as he laid back and waited for the fun to begin. As an afterthought he punished his minion that had never found any information on the outer-worlders and sent another one to continue the search.