If ND can stand for nondischarge, then I have a second hand story that also involves an AD.
Many years ago, i had an ex who was a deputy Sheriff. She was only a deputy because her dad was a high ranking Captain in the sheriffs department; she really had no desire to be a cop, and she was way too girly to be a cop. She came home from work one day and said she was being investigated by Professional Standards, which is the modern way of saying 'Internal Affairs'.
She and a partner were on a call for a guy on meth, and the guy had warrants. She had her gun drawn, and she was clearing rooms in the house, where the guy was allegedly hiding. The suspect comes dashing out of the closet towards her and her partner, and he's got one of those little baseball bats. This would justify deadly force. Instead of shooting him, she shrieks and throws her gun at him.
Her partner, startled (imagine being in a small room and all this is happening), apparently has his finger on the trigger and unintentionally discharges a first round straight into the floor and an intentional second round, straight up into the ceiling. The second shot, according to the partner was to defend himself against serious bodily injury because this guy was charging at them with a deadly weapon. But the shock of the scene, the close quarters, the speed of unfolding events, and my ex shrieking and probably blocking his clear shot was too much for him.
Three weeks later, they fired her.