It does not matter WHY the biker stopped. The fact that the cop claims he could not stop that fast because of the way the biker applied his brakes is admission of guilt! He MUST be in control of his vehicle at all times and he MUST follow at sufficent distance to allow him to stop without crashing into the rear of the vehicle in front.
Had the officer said he was sorry he bumped the biker instead of becoming aggressive it would be a non issue.
I would like to see that officer suspended. I'm also pleased his face is known to the general public.
It doesn't seem like the bike was traveling very fast. Not being able to stop your cruiser from 20 miles per hour isn't expert driving to say the least.