Whether they truly announced themselves a big part of the contention. My understanding is that even the neighbor disputed the fact that an announcement was made. There is also reports that one of the officers fired shot into the home without any target in sight.
Personally, the no-knock raid need to go away, except in extreme circumstances.
The NY Times article indicated some neighbors say they shouted POLICE only once and Mr Walker says he didn’t hear them (but he did hear the other noise thinking it was her convicted drug dealer ex-boyfriend).
I’m not a fan of the no-knock raids.