It was in fact the pas de trois, (which Danilova came to Hamburg to stage), and I remember that Baryshnikov's variation began with a huge, sideways jump. Additionally, many years ago I saw the Kirov in what was described as a pas de deux from Coppelia. Neither music not choreography resembled anything I'd ever heard or seen in Coppelia, and I was later told that it came from Le Pavillion d'Armide.
This is correct, the jump was to the side, it actually could have been on the diaganol from what Doubrovska told me. There are a couple of books on Nijinsky that discusses the variation, I'll have to look for them in my library, but it describes the choreography.