I don’t believe his claiming from the following three points.
First, the damage of his car was too light to make him injured. It was just scratch.
Second, his break at the collision was too light to make him injured.
If he had stepped break suddenly, the cars in the back of us would have been involved.
Third, the police who came to the accident venue confirmed us there was no injured in both of us. So he left the venue without making any report.
I know symptoms of some injuries from car accidents appeare later.
However I don’t believe his clamming at all.
I also know if I hadn't caused the accident, nothing would happened to him.