Evading The Heavens, Potential Spell?
William wasn't concerned about his teacher, who had displayed mastery over the Illusion Element. When he saw Tenningbrew "die", William felt that it was too easy. The man had hardly tried to defend himself!
If William had to guess, the eccentric Professor Tenningbrew was still within the room secretly keeping an eye on the situation. If the Professor's stealth technique was enough, William hoped his chances of doing the same were higher.
That was until the fake-desk William started to shake.
Shit! I lost focus for a second! William controlled the Illusion Spell to rot away one of the desk's legs, forcing it to snap apart. The desk fell over, William's fake-self going with it until his new form was a pile of wood and metal.
"These backwater Planes really are garbage!" the Heavens member who had stood up to investigate spat on the floor. He turned around the way he came, "Let's get out of here before I catch their filth."