I think that the stats on draw, firing and accuracy in a matter of seconds is very interesting. But in a life or death situation, fine motor skills are out the window unless you shoot tactically literally every day. I believe the best practice is to take cover 1st in a fire fight situation and shoot from cover, and in the situation of a knife or any non-firearm type weapon drawing may not happen and some sort of evade or block tactic may have to happen 1st before draw and firing, especially with a concealed weapon.
Within 21 feet, someone can stab another before that person can draw and fire. Blocking/evading the attack 1st before throwing lead will in itself, save your life. But the times mentioned in the post demonstrate how crazy fast things can happen and obviously, training for it is paramount. 21 feet...I tried it both ways as shooter and stabber. Too close to draw and shoot when they come running at you. Law enforcement know that if someone brandishes a knife within the 21 feet, its game over for the perp...its too close and not enough time to draw.
"The sheepdog, who expects the wolf and is prepared for it, thrives in the combat environment...and accepts the fact that on any given day there are bad people in the world who are able and willing to hurt you." --Lt. Col. Dave Grossman