She’s screaming “get back”.
She obviously overreacted out of fear. She probably thought she was moments away from the crowd rushing her when all they were doing is trying to find the quickest way out of there even before she started spraying.
She obviously was in a panicked state of mind. Even some of her fellow officers were looking at her like she’s crazy.
Thats what happens when you put a badge on a 5 foot 100lb affirmative action hire.