First off fantastic game well done. However in the turn where the sherman was destroyed by the Panther V I would believe the rifle squad will still get some cover because the wreck is still there and its steel and very large. It didn't completely evaporate which is what 0 defence implies. I would recommend you look at this type of adjustment perhaps where a wreck counter is placed and it affords say "3" defence while behind the wreck. Unless of course I have over looked something?