NSFW or children.
Very close to a worst case scenario.
The ASP video lets you link to an off YouTube channel where you can see it.
It is horrible, and the courage one of the victims shows is heartbreaking and futile.
Lots of bystanders too shocked and horrified(and unarmed) to do anything. A security guard fulfills his role as "Security Theater" by calling the cops. The perp simply waits for the police and surrenders.