Yelling Man

I was walking to my bus stop to go home and I heard a man yelling "ting" and punching the air like you may do in a marshal arts class. It could have been "king" too. He would take short breaks but continued. I was about twenty feet away and a woman said in almost a whisper, " so help me if he comes over here I'll knock him out." It made me chuckle. I was thinking I had seen and heard this type waiting for the bus before.
Bus rides = entertainment.