The witness made a claim in passing then disappeared

While walking to my car . A witness stop an stare at me up and down. And ask what the f am I looking at. This person went into a crazy rant trying to coach me into some kind of Confrontation. The incident was very disturbing and upsetting I finally got to my car and pulled off and was pulled over by the cops for a driving too fast. I thought I was in trouble for speeding only to find out that the witness made a claim that I threaten him. To my dismay I told him that never happened. They went back to get the witness an the witness just disappeared Into the Night. I was not charged but they took the report should I obtain a lawyer now