Regarding our friends polyphs. This is save file before I shooted it using phosphorous rounds. Hit succeed and polyph start burning. Immediately skipping turn and it walking. It was second big 2x2 who did it, first did not. Using OXCE on Windows 10 x64. You might need experiment with RNG, because I have no idea how it will work on you PC. But on mine aquanaut hit it successfully and triggering that bug. The things what I have found - hitting it to it's left upper or down left corners of it's sprite model with 73% accuracy triggers walking, but hitting a little bit further with half of accuracy (yellow 36% number) to right upper or down corners not let him walk. Happy investigating, hope you give us some info if you can reproduce it yourself.