Why is A Si, a disciple of Chen Pi's Red in February, included in Old Nine Gates?

He was not the fourth child before. He killed old four. Be yourself

I walked four times in the old Jiumen, and I called Chenpi four times. February Red's apprentice, because of his high talent, was taken in as an exception. One of the best in the Old Nine Gates, he is more accurate at playing iron marbles than a gun, and his nine-claw hook can hook back raw eggs more than ten meters away.

Chen Pi A Si: It is said that he is the most inhuman of the nine families. He once killed everyone in a village to pour a bucket of water. When I was a teenager, I was an apprentice of February Red. I respect February Hong and his wife as parents, and I like my second wife very much. After his wife's death, his temperament changed greatly, and he was ordered by February Red to never enter the house again on the grounds of ruthlessness. He also took his wife's favorite crab to worship in front of February Red Gate. When Wu Xie met him, he was 90 years old.