Camera angles can lead to deceptive images. Possible he is nowhere as close as this looks if it was a zoom lens. However it looks to me as if he is pointing the muzzle in the general direction of the passenger compartment.If the picture is accurate then he should at the least be re trained, and possibly punished, depending on the whole story. Which no one here knows.
I can't see a reason to shoulder the rifle in that situation. Poor decisions with firearms rate pretty high on my douche-o-meter and this guy may not be a match for a career behind the trigger.
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That's not what you said last night...
SHHHH