I know this is a very, very late observation but I've only just realised the 'mirror' premise of the last section.
As well as being amazing in its own right this also raises the question:
Does that final fs 50 have the highest ever ratio of pressure-to-make vs ease-to-do of any trick ever filmed?
According to Jenkem, if hadn't got the final line they wouldn't have included the final section at all, as he was determined it had to perfectly mirror.
So if he'd messed up that front 50, he would have either had to get the nollie heel suciu grind again (the trick that already delayed the video's release by months) or shelve that whole section of the part...
Imagine trying to keep your mind quiet as you pop into that...
Really hyped that that's how it ends now I know the full story.