I’m in the course at this part as well and it’s…uh…quite a step up to say the least. I’ve been playing for like 20 years but with super ass picking technique so this type of stuff is great for me.
While I haven’t mastered the down-sweep part I have figured out sort of what’s going on, I think, with this riff. It’s set up in to little blocks that always have a double downstroke when you’re supposed to be moving your left hand in to a new position (I think).
Think of it like doo-doo-dah-dah-doot-doot (the doot-doot)_ is always the double down) doo doo dah dah doo doo dah dah doot doot, etc…doing this off the top of my head but I hope it doesn’t sound ridiculous.
Couldn’t play it right until it was broken down in to phrases that revolve around the double downstroke and change in hand position.
TL;DR - aiui it’s not broken down anywhere, but taking the time necessary to master it has huge implications later.