Just don't be like the CCW holder who tried to intervene at the Walmart shooting.
A) Violence of action
B) Commit and stay committed
C) Second guess afterwards
D) Good luck
I have no plans or plans of action for an active shooter scenario. I'll react as the situation dictates, unless I get perforated first.
ETA: It's not just the Rambo wannabes who suck. Plenty of good ol' boys give epic fail proof at the 7 yd pistol line and 50 yd rifle line every weekend.