Stowers called 911 on his cell phone from inside the vehicle after being shot.
Nor would they be carrying a firearm in their vehicle
No idea what you are relating to. The marshall?
WRT "carrying a firearm", I was responding to your comment:
"Any common citizen would be serving time."
Stowers called 911 after engaging the marshal. A common citizen, upon witnessing his wreckless driving, or being confronted by him, would have called 911.