Grey's battle experience is shocking for his age, he has been in too many life and death fights since he became an Elementalist and started his journey to the top, so being put in this position, his frightening ability came into play.
The Tribe Leader, who thought it would be able to fully suppress Grey now that it had gotten serious, was stunned when it noticed the change in Grey. It could tell that this wasn't something that just came, rather, it had been honed for years, and now Grey was just showing parts of it. Against anyone his age, Grey could be regarded as the number one in terms of battle experience.
