Frank_N_Stein
Grandmaster
I heard sirens at the beginning. Doesn't that tip off the residents? At 9:00 am I hear sirens and then door knocks, I may not have enogh time to answer the door but I surely could drop my weapon and get my hands up. Sure is easy to second guess by watching the video.
You can also hear someone yelling "Police, search warrant, open the door" before they make entry. The officers might not have knocked, but they sure made their presence known.