The biker the SUV first hit did a break check in the middle of the road without considering his surroundings. The SUV driver wasn’t able to stop in time and slightly hit the bike causing the biker to lose his balance and sprawl on the ground.
THen the fight started...
“The SUV driver wasn’t able to stop in time”
“For purposes of insurance and policing, the driver of the car that rear-ends the other car is almost always considered to be at fault due to not leaving enough stopping distance or lack of attention. An exception to this rule comes into play if the rear-ended vehicle is in reverse gear.”