Too Cunning

There were still six people left, and the old man was an Earth Elementalist. If they were able to plan carefully, then there was a large chance that they would be able to defeat Grey. 

The old man's plan was to guess who Grey would change positions with and attack the person just when Grey was changing positions with them. 

Before they gathered, he placed earth particles on each of them and gave them all access to it. The second they sense the slightest sensation of one of the earth particles disappearing, then they should attack that place. 

When they all grouped up, they started to attack Grey. Their combined attack was powerful so Grey was careful, but seeing all of them gather, he couldn't help but start to think.