A man and a woman were involved in an altercation on Welham Road at around 9.05pm on Friday January 9.
The potential witness was driving a hatchback car down Welham Road. They saw the incident happening near a grey BMW and stopped to intervene.
The man involved in the altercation approached the potential witness and shoved them in the chest before running after the woman. The woman got into the grey BMW and drove away.
If you are the witness, the police are keen to hear from you. Contact North Yorkshire Police with any information by calling 101 and selecting option 1 and quote reference 12210011242.