Hollow Knight Godmaster: Watcher Knights Radiant Nail only

I haven't done this fight much so Radiant was surprisingly tricky.
The key is that their rolls have slightly different cues, and you need to watch carefully which they're about to use.
RNG can get bad though if they both keep rolling up and down. Avoid the corners unless you're climbing the walls.
It also helps if you can focus one down and then damage another while the next one spawns.