Seems to me that this could have been avoided by a couple of different course designs:
1. Having some space between the 2 lanes of traffic. This would've provided space for off-course riders.
2. If you're going to have the 2 lines right next to each other, separate them something other than just course tape, like snow fencing.
If you watch some of the other video from the race, guys are flying off the course as they come around some of the turns, in many cases taking the course tape with them.