Well the door was open, so he wasn't "in" the vehicle... it also doesn't show if this was really an "improved road" which is illegal to shoot from, a private lane etc etc. Also paraplegics can get a permit to let them shoot from inside a vehicle (there was a story last year? or 2 years ago here on MM where a guy shot a spike elk out of his truck).
I know we are all jaded now and immediately jump to the conclusion everything we see or hear about is illegal... but it doesn't necessarily mean it really was.
The only thing that bothers me about the video is he went for a headshot, I like to see shots in the boiler room.
-DallanC