Its good principles applied to knife vs gun .
that are also good rules unarmed.
OODA loop and getting of the x
getting a fence/guard/spear out there verbalising , nothing that isn't going to help.
every idea , every thought , every action is another complication , you need to make them work , and you need to keep moving and flowing with your one objective, enter and destroy .
I've done this drill without the gun , fun thing for class , the key being the committed attacker , wont take long till every admits how hard it is once you get a committed swarming attacker.
then when there all happy playing both roles and how dangerous the knife is , shorten it up get the biggest meanest guy to swarm them with piston punches and a freight train intent .
you'll soon see the lights go on or off , and all the sparring mentality go out the window. It'll be all matador and counter ambush after that or just straight ambush and the roles reverse.