If I am brave enough to voluntarily go h2h with a guy who just took down a trained officer when I have a gun... then I am not going for a strike. i'm going for a rear naked strangle, pulling him backwards and hooking his legs until the officer can gain control of the situation.
Flying knee to the bg's face followed by pepper spray. Restrain Until officer can get up or the guy is unconcious. If I see he has a firearm clear line of fire and pull the trigger. Once im older it will probably be the bg getting my shovel across his face.