What the hell is going on in King Crimson's Frame by Frame??

"Death by drowning, in your own analysis". Those lyrics seem fitting as this week I'll delve into just what the hell is going on with the dual guitars in King Crimson's song "Frame by Frame", one of my personal favorites which I was fortunate enough to hear Adrian Belew perform on Cruise to the Edge (which explains the sunburn).
I apologise if this video is confusing and doesn't really explain anything, but to be fair I was confused myself. Let's take a look at this head-scratching riff.

Видео What the hell is going on in King Crimson's Frame by Frame?? канала Helgi Jónsson