wait guys I am dumb enough to misunderstand what exactly happened

The top is well known for being super in control of not knotting when he is with his partners but he got very caught up in the moment with the bottom and knotted him. The problem is the bottom is a beta BUT the top is reacting to him like an Omega that's what he was shocked to find out the bottom was a beta. So the top is confused about his feelings and lack of control around the beta (bottom).

Ohhhh okay that makes sense tyy!