Like mentioned before, when he was in a conversation and the other person was anticipating a response, Eryndor couldn't take too long as it would seem out of place.
Eryndor was quick to shake his head.
Even without the existence of the mental defense treasure, he would've rejected the young boy.
He planned to keep up the persona of Clarence. That is, acting alone, barely interacting with people, and cooperating with disciples on only a few special missions.
The young boy didn't insist on inviting the disciple who had taken on the same mission as him.
Even though he was fifteen years old, as someone who lived in the cultivation world and even enrolled in the Training Camp, he wasn't oblivious to how things worked.
He was mature for his age as compared to teenagers of similar age on Earth.
Backing down, he entered the same string of numbers which the counter soon analysed and then modified the information in the badge.