But he was noisy to boot, so much so that the neighbors were a bit concerned. They were trying to sleep. They called 911. The rest is predictable. A veteran officer shows up, sees an Asian man with a stick who looks like he knows karate.
Thought processes go off.
Better shoot him. That's police training for you. Forget that Kao wasn't holding anyone hostage. Nor was he a menace to anyone in particular. After all, Kao had a stick.