As it says in the title, when the Berserker knocks an enemy unconcious, the game begins to behave in a very strange manner.

This issue seems to be mostly isolated to the Advent Officer but I haven't done a whole lot of testing on other aliens to make sure. At the end of a turn where there's an unconcious Officer, the Alien's Turn hud shows up but nothing happens. The camera stays focused on one of your squadmates and after a minute or two the turn ends with the aliens in the same places they were before, no shots taken.