Well, then YOU of all people should know that when your on the trail riding fast, no wait super fast, that there's still a difference in that compared to when you've been past the edge and there's one person behind pushing you harder and there's another person in front your so desperately trying to catch. Knowing, you may not have much left in you, but somewhere you have to find the extra uumph.
There's a difference when your out on the trail for 30 or 40 minutes and have the luxury to stop and take a piss if need be, stop and grab a drink, you can slow down and wait up for someone, back off the throttle for a moment when your thumb cramps up.
You of all people should know that when racing for 1.5+ hours, there's NO stopping, NO backing off, it's riding at the edge of control for over 1.5 hours. Sure, the first 30 or 40 minutes ain't so bad, but after that third lap, things start getting numb, body parts start cramping up, your mouth is caked with dirt, your legs are becoming rubber, your out of tear-off's and it's getting harder to see, still no stopping, gotta make up more time.
If that's how you trail ride, then my hat's off. And by the way, I'm not here to prove what I've done, how fast I can ride and what I can do, that's what real-life is for, not the internet. I'm not too worried about impressing someone on here. If you don't like what I have to say, hit the back button.