It is not under-development but loss. When first meeting his soon to be adoptive mother, at first in the wild, things did not go well. She did not know his origins, only that he was possible trouble in the area she was scouting. Pursing aggressively before realizing what she had done and his true age, she was horrified but not before she had severed a noticeable portion of his right ear.

While his hearing was un-effected, the sensitivity for this ear to any sort of sensation increased dramatically and it's consequences still remain there to this day. While some sensations such as wind breeze or water do little to nothing, others such as touch often bring about other feelings.

At best any sort of touch even from loved ones or family, brings about anxiety and often impedes his abilities. At worst, he'll fly into a full fledge panic attack which translates the rush of the traumatic memory into physical feelings such as shortness of breath and small cases of cardiac arrest. It is his most avoided and protected by Ace other than his brain.

Marked mature for implication story and description effects.