Yep, her behavior is a textbook example of incompetence.
On top of every other valid criticism that has been shared in this thread, this officer escalated the situation rather than tap it down. She was super jacked-up from the second she arrived on the scene. There were already guns trained on the man. But instead of calmly asking the man to cooperate with them, she raises her own gun and literally SHOUTS at the man in a voice that would have scared the sh*t out of me if I'd been her target. That voice literally screamed that she was jacked-up to the max and in danger of doing something stupid.
One has to wonder how she got through her police training. Maybe she was having a 'REALLY BAD' day, but based on that video, she failed to display the level of calm, emotional maturity necessary to handle a high stress situation. In fact, she was actually the one who made this one high stress.