I learned a long time ago, NEVER turn in front of a cop. They view it as disrespect.
And he could have followed me. I would actually not care about that. I live on a “cut through.” I see the cops going up and down my street every day.
Funny story: One night at about 3 AM a cop got a flat tire in front of my house. Within ten minutes there were four cruisers (the entire force on duty) sitting in front of my house with their high beams on. They all stood around for an hour while the cop changed his tire. He had only half of the equipment to do it.
But he had enough firepower to take down the riechstag.