Can you tell Fripp from Belew?

This is right.  I can tell them apart easily when they are doing their own thing.

On a tune like this, where they're using the same tones, it wouldn't really matter who is playing what during the instrumental sections. The main conceit of that piece is that the guitars are playing the same repeating figure, but one of them cuts off a note at one point while the other remains consistent, creating a phasing effect inspired by the work of serialist/minimalist composers. I would imagine that Belew is playing whatever part is easier for him to play while singing during the vocal sections, but upon viewing live videos, it honestly does not look any easier at all. It takes a lot of practice to get this right (or at least, years of getting used to singing while playing something that is of a very different rhythm than the vocals, something I'm working on), and seeing Beat live did not disappoint!