I have no idea what he said.  My comment stems from carefully watching the video which pretty clearly shows the entire sequence of events.  The motorcyclist shows zero evidence of being aware of the pursuit until the police car hit him from behind when the motorist came to a full stop at an intersection.  At no time did the motorcyclist turn his head behind evidencing awareness of pursuit prior to being rear ended.  But these are only my conclusions based on careful viewing of the dashcam video.  Perhaps if you have a look you could see additional evidence that I missed.