The very smart and obvious thing to do would be to announce themselves loudly on arrival; all squad cars have very loud speakers on them and most police departments have at least one armored vehicle specially for high risk situations. Breaking in through a bathroom window and then running around the house with guns drawn is a recipe for disaster. If this kid had had good pistol skills (not that unusual unusual in the US) it might just as easily have ended with one or both of the cops getting shot.

Police in many jurisdictions will just walk onto your property in pursuit of a suspect and get mad at you if you open a window or door to see what the hell is going on outside your home.