My friend was being passed, then they would slow down, he would pass and they would ride his bumper then pass and slow down again. Cutting in too close when passing him. I wasn’t there so I don’t know what the tipping point finally was.
Incidents such as this are why I have a dashcam and a hand-held Go-Pro. Every single time I’ve stuck the Go-Pro out the window to record somebody doing something stupid behind me, they’ve backed right off. It could be a plastic box on a stick, but they don’t know that - and they wise up right quick.