This guarantees that the homeowner will be asleep at the point that they yell "Police" and it will not register. All the homeowner will be aware of is a loud crash and masked men charging into his home
That's the point of the hurried entry and all the yelling and shouting--to disorient the people inside the building.
Usually, nothing happens that results in a death--but sometimes ---- happens.
There have been other notorious cases, sometimes where the death of the homeowner occurs. And in some of them, the police were at the wrong home with an invalid warrant.
---- happens.