So, playing a terror mission and I keep seeing my heavies fire their guns without any TU or sometimes even ammo. when they fire, they just go through the animation and pause movements, they don't use ammo either so it isn't really that big of a deal. The only real problem is that when this bug occurs during missions such as terror missions the alien turns take a very VERY long time because they can 'shoot' at enemies that aren't even visible. Not game breaking but really friggin annoying.