There is a court case many years old. I cannot remember that case name or its exact wording, but it's something like this. You cannot create your own peril and then use deadly force.
Watching the video, he created his own need to use or justify deadly force by climbing into the hood.
If the officer was justified to use deadly force before he stood in front of the car or climbed into the hood, then that case would not apply. We don't have enough information to believe if deadly force was lawful at the moment before he stepped in front of the car. Either way its tactically stupid to step in front of a vehicle that could run you over, unless you can shoot before stepping in front. If so, shoot until the threat stops.