It is 47 km into the race and I'm walking downhill through a forest towards Burglauenen. It's been a great race so far. I passed the last check point (Faulhorn, the highest point of the race) 15 minutes before my expected time and enjoyed running downhill to Schynige platte. A few minutes ago, when I approached a corner on this muddy terrain, a sharp pain hit my left knee so badly that forced me to stop. I cannot run anymore, I am using my walking sticks to take some weigth off my knee and slowly walking down. I could have run this part of the race quite fast and effortless if my knee didn't hurt. Through my training, I put so much effort to master my downhill running technique and I was quite confident in it that I'd consider it as one of my strength points. It hurts a lot when you have trained a lot and on race day you just cannot perform well. In fact that is hurting much more than my sore knee. As I am limping cautiously, there are many runners passing by, mos