Well! I've never seen this before. I don't know who the guy was in the PNZR - or is it a TIGR? I really struggle with computer graphics... Anyway, he was an expert shot, and took out my field gun with a single shot. VH was still up, so I jumped in a PNZR to return fire. I got his turret, so then he drove up to the field - possibly with the intention of shooting the other ack.
The Map Room was between us, so I waited for him to emerge from the left side, when - !!!! He appeared right in front of me, having passed THROUGH the walls of the map room! Not only that, he was firing the pintle at me so I knew he must be able to see me.
Look at the picture. Notice how the smoke from his turret is interrupted near the roof of the map room. But lower down the picture, I seem to have X-Ray vision - except that he had actually passed through the map room!
A bug? A hack?

BTW - I shot and destroyed the GV after this pic was taken, but no kill credit - not even an assist. All seems a bit fishy...