I just have met “buffed” siren with amount of HP I didnt’ saw earlier - 63. I started to check all her body parts and there was an arm which looked like combination of two arms in the one. I’m not sure it this was meant to be an upgraded mutation of such arm, so the siren could be more dangerous enemy (it is quite late in campaign and I just got to place where are probably 3 alien citadels or more(?) so maybe they can develop better mutations?). Or was it just a bug of duplicated attachment of an arm to whole unit which resulted in doubled stats. But overall disabling that arm hung the game. Animations were working, I could even select some abilities, but camera was frozen in one place - in perspective of a soldier who disabled that body part.
