That doesn't matter. It's not enough that they were doing their job beforehand, their actions at stake have to comport with their actual duties.

So is it part of their official duties to walk in front of a car of someone who is trying to leave the scene, alter their path when the car turns out of the way to ensure they remain in their way, and then shoot the driver? Or is that merely the kind of excessive force that's in contravention of their training and not part of their job role?

Watch the video, it’s obvious. The person was stopped as part of an ice directive.