That trail under the racers chair is called Slickrock. Many riders favorite trail. Smooth, then in and out of some world class single-track. Slickrock Trail also leads you to the stream crossing in the other picture.
I guided that group down at the end of the day on Saturday. They rode the shuttle all day, and joined us for our daily 4:00 pm ride. Big fun!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Here is a picture from Decline Magazine of pro downhiller Lars Tribus on the same trail in the fall: