That was IN-freakin-CREDIBLE!!! If that video doesn't make you want to go ride, I'm not sure any other form of media will!
I was in the Loretta Lynn's and Weekend Warrior Titan GNCCs and they were some crazzzzy muddy races. I'm a C-level rider really, but entered the main even in B Open just so I could get the 3 hours instead of 2 hours. I got hung up a couple times where the pros needed to get through, so I offered up my bike as a "berm." It was quite a humbling experience :) On other occasions they would pass me in the woods and, WOW! LEllis7motox is completely right. It's incomprehensible how these guys go so fast through the trees! I'm working on it myself, but have a LLLOOOONG way to go!