It's not clear who bumped the SUV.
Was it an officer on a police chase? If so, it's a textbook illustration of how
not to stop a suspect.
If it was not someone in law enforcement, then hopefully they were caught and had charges filed.
This video would make an excellent buckle-up public service spot.
One criticism of SUVs is the poor rear visibility promotes a feeling of safety, which this video obviously dispells. Of course the bumped driver did not have a lot of options.