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Disclaimer......I took my original class sometime in the late 90's and probably (certainly) don't remember exactly how we were taught the law worked in situation such as this and in all my renewal classes we dint get into a bunch of different scenarios but.....

I'm 99% (let's make it 51% sure) we covered something similar to this and they talked about "necessity" and or "defense to prosecution" applying here. Not to say that we were taught correctly but it was two officers teaching our class and they were pretty sharp.

I think the scenario was you were walking your kids into their school and had forgotten to disarm. A BG also comes in and starts randomly shooting people. Are you allowed to "break the law" and neutralize the threat? I think their (the instructors) thinking was that preservation of life in this situation trumped the law that was broken and there would be a defense to prosecution for taking action.
Even if this was untrue, I'd think (hope) that you'd have a rough time getting a jury to convict a person for doing the "right" thing and that may be what the instructors were thinking as well when they said to take action to save lives.