Since before his reincarnation as a demon, he was a human. Consciously or subconsciously, he was trying to suppress the demonic side of him. However, by doing so he was also suppressing his desires along with his strength.
One's desires and cravings was directly related to how strong one was or could become. This was especially true for the demon noble race who followed and abided by their desires closer than any other race.
Since Simon was suppressing his emotions along with his desires, he found himself somewhat lacking and unable to show the true potential of his race. Taking a deep breath, he cleared his mind of all thoughts and allowed that which was deeply suppressed in his heart, to flow and rage.
The feeling at first started out as a small ember before flaring out to become a huge wildfire that prickled every nerve of his body. His blood felt like it was boiling and an innate urge to destroy his enemy flooded him.
