"Firing into melee" is not a skill one should cultivate.
Incidentally, those three guys managed to get Lucky when there were only two enemy friendly fire kills because the Pz38nA rushed all the way across the field (Malinovka) and crashed into a clump of vehicles, right before the Valentine AT shot it in the back. So adding to the suiscouting and friendly fire failures we have the "not spread out fast enough" failure.