Cops rely on criminal stupidity and relative training difference between them and the average person to do what they do. Sometimes someone gets lucky, and does something unexpected but simultaneously very effective, and this happens.
Your average police arrest warrant could not happen if they tried it against an aware, well trained and equipped opponent.
For most houses, against rifle fire, exterior walls are not cover, they are concealment, and if the subject sees police stack up on their front door, they can engage them through the wall.
Cops rely on criminal stupidity and relative training difference between them and the average person to do what they do. Sometimes someone gets lucky, and does something unexpected but simultaneously very effective, and this happens.
Your average police arrest warrant could not happen if they tried it against an aware, well trained and equipped opponent.
For most houses, against rifle fire, exterior walls are not cover, they are concealment, and if the subject sees police stack up on their front door, they can engage them through the wall.