I call people like him "punishers" Ill tempered, moody people who only get relief, or satisfaction, after they see the other person suffer long enough, or to a degree great enough, for them to feel like the other person has paid enough of a price, and then on the pivot of a dime, suddenly smile and completely change their demeanor. This is not a conscious thing either. It's a sick, deep-seated part of their personality. He did this early in the episode when they were "resolving" their first fight of the episode at one of those stand-up cocktail tables on the terrace. He'd punished her long enough and watched her break down and melt away, and then, BAM! He had a grin on his face and was ready to go back to the rest of the cast as if nothing had happened and that none of it was a big deal. He punished her long enough to have all his own stress leave his body. It's a weird Jeckyll/Hyde thing that is also bullying and cruel. Not to give them an out, but I don't think people like this even realize this is their process.