Just about every question that could be asked already has. Here's one that I don't think has been asked, though.

Is there anyone that the non-expert level riders should not follow? I probably can't keep up with Girlscout, so I don't have to worry about following him down any drop-offs. Anyone else who is on the do not follow list?

I ask because a friend a kayak with is notorious for taking the most sketchy lines possible. He always seems to make it through, but I had some close calls until I deciced that I will not follow him ever.

Challenging lines are awesome, but I already have bent enough stuff on my bike to meet my quota for the next couple months. I tend to ride harder stuff better by taking a good look at it first.