And one other thing.
Once the point man entered the room, he had to own it. A quote in the article referred to the Sgt as stating that he was trying to "dig the corner." What that means is that when entering the room, his primary responsibility was to own either the left or right side of the room, all the way into the corner. And even though his primary responsibility changed the split second that Golf Club Boy showed up, even with all of the training in the world, he is still going to be thinking about digging "his" corner. In a perfect entry, the team would flow into the room and the 3rd man would pick up the corner that the point man was originally tasked with. If there is an armed suspect in that corner who had decided to shoot it out, then you will have to take those rounds and attempt to overcome that threat with superior firepower.
And he had to do it immediately because the guys following him in all have their responsibilities also. Usually the 3rd guy would be responsible for going long where Golf Club Boy presented himself. But the Point had to assess and confront because Golf Club Boy presented himself.
Also keep in mind that you are trying to get 5 to 7 guys through one, small residential entry doorway in a matter of seconds. If the first or second guy gets shot and goes down, then you will have a traffic jamb at the door and everybody else will also get shot.
Pretty simple stuff really. or is it?