A good number of the cloister bosses represent scenes from the Apocalypse- and I think this must be the first of them. John is asleep and Jesus is creeping up behind him. That's not exactly how the text says things happened (in the text St John hears a voice like a trumpet and turns to see one "like unto the Son of Man" in a blaze of glory) but the figure on the right is definitely Jesus (no-one else wears a halo with a cross in it) and the beardless male is almost certainly St John so what else could it be?
