It says "could often continue fighting" as in hypothetically. Most of these people aren't fighting for their motherland or fatherland, but just to stay alive. There is definitely not enough motivation for troops to continue fighting after they are shot for it to be a legitimate possibility. Maybe one or two percent would have such brainwashing that they may continue, but think about it. If you are shot in the head, chances are you would be greatly disorintated and/or blinded. If you are shot in the arm or shoulder and if you manage to break through the pain, you will not be able to fire anywhere near accurately. If you are shot in the leg, you are not moving well, and the pain would probably be keeping you from returning fire well. If there is no pain, that means your body has begun to shutdown and you are dead anyway. If you are shot in the torso, a number of problems may arise.
I guess that volunteers usually have a much bigger cause to fight for then conscripts. I must say it sounds very unreasonable that one could fight back after ten or twelve 9mms though. They also loose a considerable amount of energy in trasit from the barrel to the target because of the bullet's size. Still, rifle rounds should be one hit casualties out to 300m due to their size and velocity. It is rather bothersome to see a soldier get shot point blank by a bolt action rifle only to become "wounded".
Oh, and a link to the thread that contains the aformentioned external tools would be greatly appreciated!