For one exquisite moment, didn’t it seem like the trailer for A Promise might be setting up some sort of polyamorous live-in protégé situation between Alan Rickman and Game of Thrones’ Richard Madden? Sadly that plotline will be left to languish in our extensive slash-fiction archive, as director and writer Patrice Leconte’s film instead features Severus Snape and Robb Stark in a breathless German love triangle with Rebecca Hall. Let’s all just enjoy this trailer on our own terms, okay?