From Luke's perspective Jesus is on a journey. The disciples are following him but only vaguely aware of the destination (at least as Jesus sees it). At this point in the story Jesus turns towards Jerusalem...
A digression into John's Gospel and the story of the man born blind...an image of redemptive suffering and the lucidity born of the victim's epistemological advantage.
Coming down from the Mount of Transfiguration into the demon possessed valley...Jesus tells his disciples "the Son of Man is going to be betrayed into human hands"...but they could not understand this saying.