a battering ram at hand when they knocked?
Why didn't they wait for the occupants to come to the door?
Why did they serve the warrant after midnight?
The fact that they knocked on the door doesn't mean that they did not have a no-knock warrant - the bf said that he heard someone knock and then break-in, so this really isn't anything new.
https://www.documentcloud.org/documents/7071135-Walker-Complaint-2020-9-1.html