Did you get his name, the time and location? Register a complaint with his department if you think you were wronged.
I think it would be highly unlikely that he would haul you in on a traffic infraction. Law enforcement don't like paperwork any more than anybody else. But he can, especially if the person stopped gets mouthy with him, not to say that you did. Most likely he might write you a ticket. But the only way to fight a ticket in court is to prove you were in the right, and it's very helpful to know that ahead of time.