re: If your kid called you from school and said there was an active shooter?

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I would be willing to say it would have been more likely that it wouldn't have made a difference. 

The chances are low that a teacher carrying was in the proximity of the shooting, was able to first make sure his/her students was safe, then prepared the weapon for engagement, engaged, and then did it effectively before it was all done. 

That's a lot of specific things that have to happen perfectly, especially for people who aren't trained (like SWAT) for that situation and would also have other priorities (ensuring his/her students' safety) that would take priority. 

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Okay, since you continue to play "the hypothetical game", I'll play.

Let's say that the male football coach concealed-carried a Glock 19 (9mm with 17+1 magazine). He barricades the door of his classroom and has all of the kids take cover on the opposite side of the room away from the door. He takes cover closer to door opposite of the students. The gunman tries to enter the classroom and can't open the locked door, so he shoots several rounds at the locks to attempt to bridge the door. The coach returns fire through the door with several rounds.

What the frick do you think the shooter is going to do if he isn't hit by the shots? Continue shooting at the door and attempting to enter the room and have a shootout? Or abandon the plan to enter that room and look for another?