Quote:
“Alex was passed out on the sofa after drinking two bottles of champaign when they went outside. When he went to grab the duvet he just grabbed the first one he came accross, he didn't know who was under it.”
I think you'll find that he spent some time trying to sleep without the duvet that had been taken by Kate, first. I may be wrong.
However, the point still stands that Kate knew that it was Alex's duvet she was taking, and the duvet had been taken from Alex first.
I thank you for your reminder that Alex did not in fact know who he was taking the duvet back from.