Missing the point of knock and announce

In comments below, Terry at US Marijuana Party mentions this story from back in April in Buffalo:

A loud “flash bang” concussion device is detonated inside a Kensington Avenue house as Buffalo Police SWAT officers, clad in black armor and brandishing automatic assault rifles, storm a lower apartment.
“Buffalo Police. Search warrant. Buffalo Police,” the officers yell to the now temporarily stunned occupants inside.
Within seconds, there are multiple shotgun blasts. At the same instant, another officer cradles a 1-year-old boy out the front door and down a flight of steps to safety.
When the smoke clears, three large pit bull terriers lay dead, in pools of their own coagulated blood. Five people are in handcuffs.

So first you deafen the occupants. Then you announce yourselves. Then you kill the dogs. This must be what Scalia was talking about when he said “we now have increasing evidence that police forces across the United States take the constitutional rights of citizens seriously.”
Right.