The context of the following conversation is Jan slapped them in the face. They were ashamed of their behavior.:
Jan says You would not believe what happened to me today. Some guy came up behind me and started pinching my rear end..
The friend responds Are you serious? What did you do? I would have screamed bloody murder..
Jan responds I turned around and slapped him. I wasn't even thinking, it was just a reflex. I was so mad..
The friend responds Lucky for him, you didn't have a knife in your hand. You might have stabbed him as a reflex..
Jan responds You're probably right about that. In any case, the guy was drunk and apologized but I didn't accept it..