We have a fairly good idea why Luke exiled himself on Ahch-To in the first place: Kylo Ren, who Hamill suggests Skywalker believed was a new “chosen one”, murdered his mentor’s trainees and flounced off to join the Dark Side. Yet this is Luke Skywalker we are talking about, who witnessed his own surrogate parents burnt to a crisp at the outset of 1977’s Star Wars and barely blinked an eye. There must be something more here to Skywalker’s descent into despair.