Kel watched as they dealt admirably with the imaginary insects.  The fire wielder realized that it was an illusion fairly quickly, and the others were teaming up to fight them.  When the Poison Wielder attacked them, he let the illusion fall.  That was good enough for now.  That was, until the fire wielder started attacking again.  He waited and watched, but when the Lightning Wielder arrived and started attacking.  Then the other fire wielder started too, and things got out of hand.

Though he was only half recharged from his earlier uses, he knew he'd have to jump in and stop them if they tried to kill each other.  He climbed into the water and swam over.  The cool temperature of the water felt great in this weather, but he couldn't indulge himself now.  He climbed out in what he hoped was a blind spot behind the largest group and hid behind a tall, leafy plant.  Sure, losing his legs if he used his powers outside of self defense was a bit harsh, but he [i]had[/i] just attempted murder for no reason.  If that's what was needed to keep him from murdering people, he would allow it.

He focused on the ground underneath the attackers, including the one being offered the contract.  If they tried to hurt else, he would shake the ground in the area and break the ground under any attackers.  Hopefully knocking everyone over would keep them from killing each other.  Short of obvious Earth attacks and defenses, he didn't know what else he could do to keep them from killing each other.  After all, they could see through his illusions too easily, and they drained him faster than Earth Wielding would.

When the Fire Wielder offered a counter-offer, he sighed.  That would work out much better, and he wouldn't have to reveal himself.  [i]Such talented students,[/i] he thought.  [i]If we can get them to behave, they'll make valuable members.[/i]