This might be a bit of a TV trope, but I think it happens in reality as well. Suppose an officer pulls someone over for a traffic infraction and starts talking to the person about why they were pulled over. Suddenly, a much more urgent call comes out over the officer's radio, and the officer speeds off in their cruiser without giving any instructions to the person the officer had pulled over - the officer didn't say "wait here," "move along," or anything else.
What is the person who was pulled over supposed to do?
If they leave, I worry that this could be seen as an act of eluding, but if they stay, I worry that the officer might simply never return.