http://www.jamesalison.co.uk/texts/eng57.html
My hunch is this: that Luke portrays Jesus in between Gethsemani and the Cross as deliberately retracing in historical form the route back from created reality, to being outside of and thus prior to creation. From his prayer of obedience and sweat “like clots of blood” in which he is fulfilling Genesis 3,19 [3], so that the New Adam is able to get right what the old Adam had fouled up, he moves to the formless and dark void which is described at the beginning of Genesis, and once again in the darkness and failed sun that accompanied the Crucifixion [4]. Then in breathing out his Spirit to the Father on the Cross, he is entrusting to the Father the concrete historical and human form of the bringing into being of the New Creation which he has opened up by going to his death [5]. It is from then until it is breathed upon us that the Spirit hovers over the vacuum.