Except Katy dies in a second.
It's not like he did not move it. He did, but grenade and 3-4sec of small fire is enough to kill it.
I understand that katy dies very fast. So does the Pwerfer. You can still see the Pgrens before they get close enough to nade and finish with small arms fire. Im just saying that its the other guys fault for leaving his katy next to an unguarded flank. If even one unit was covering the flank moving the Katy wouldnt be a problem.