My wife busted another man's balls

I just went to her office to visit my wife, and saw there was a guy (probably in his 30s) in my wife's cabin. They were standing and talking to each other and then suddenly my wife became angry and then she kneed him right in the balls then came out of her cabin in anger.

She came out of the cabin and met me, I asked her the reason she kneed that guy, but she didn't tell me the reason, just said "forget it love" and ignored the question.