You wouldn't be as there are strict rules of engagement (ROE's) that have to be followed. When I was in the RAF and doing guard duty we basically had our hands tied behind our backs when it came to the ROE's and if anybody broke them they would find themselves in jail for a long time. Flight lines were the responsibility of the RAF Police and normal bods like myself were not permitted to do guaard duty in any technical ares or the flight line, we just did the main gate alonngside RAFP, patrolled married quarters and the perimeter fence on some bases.
Yea but that's just ridiculous.
Sure if some kid wonders in or similar, and obviously if you can avoid shooting at someone it's better.
But this example shown there is no consequences really, they should have just opened up on them. They would have in America.