There was that shooting in Oregon at the community college. Two cops in their car showed up and as they were driving they were planning on who would grab what out of the trunk as they suited up with their vests and stuff. I don’t recall if their plan was to wait for others or not.
As they drove up they heard the shooting and all of their planning went out the window. They had their pistols and maybe one grabbed a rifle or shotgun from inside the car and ran towards the sounds of gunfire.
They came around the corner of a building and the shooter took a couple of shots at them but they kept going and got him within a few minutes of getting the call.
Exactly the way it is supposed to happen.