Cubism Day 8

This is such an critical section that I'm going to devote 2 days to it. The routine here keeps all the cubes in place but flips two adjacent corners. The routine itself involves rotations of top layer and left hand layer (top layer moving clockwise) followed by a 'mirror image' routine rotating top layer (anticlockwise) and the right hand layer.

My initial aim of this sequence of blips was to try to understand and visualise what was happening and why certain routines work - rather than just blindly following algorithms.

Only problem is, I just can't see this one. I will give myself another day to figure it out.

Time from all cubes in right spots to two cubes in right orientation: 20seconds.