Ok so after the ritual with Sabrina the King asks you to meet him in his tent. When I go in there's an NPC standing there whom I can't interact with. When I leave the tent everyone is gone apart from two people tagged 'assassins'. I assume they're supposed to attack me, I can instigate a fight with one of them and deplete all of his health but can't actually kill him. Also if I visit the tent I lose the ability to save the game. I've loaded a slightly older save but it's the same story. The only earlier save in Act 2 is significantly further back, so playing from there with no guarantee that it will work isn't a good option.