Natasha is way out of it and we get the opera from her perspective. It’s a very strange description – just a literal explanation of what each person on stage is doing, without any emotional or plot context. Clearly she’s not really thinking about the performance and is instead having a bizarre out-of-body experience.
Suddenly Natasha notices Helene looking at someone and then sees a really handsome man strolling down the aisle. It’s Helene’s brother Anatole.
Like Zoolander, he is ridiculously good-looking and knows it. He walks up to his sister, checks out Natasha, then goes to hang out with Dolokhov.
Natasha enjoys being checked out by this guy, and she sees that he and Dolokhov are clearly talking about her.
Next thing we know, Helene is asking Count Rostov to send Natasha over for the third act of the opera – which he does.