Officers didn't know that....
Why rush on the bus with your gun out ?
Because you were in pursuit of an individual who was fleeing you and you did not know if he was armed or not. Once an individual attempts to flee arrest, all niceties are thrown out the window and the gloves come off!
“Because you were in pursuit of an individual who was fleeing you”
Uh, he wasn’t fleeing ...
Obviously, you have never had any armed combat training ...