I tripped on something (not exactly sure what - one second I was running, the next I was on the ground minus one layer of skin on my knee) about halfway into this (and thus, about as far away from where I started as possible). I stopped and walked back to a gas station to get some napkins/water to clean up the mess and created quite a scene with the coagulated blood running all over my leg/shoe. I eventually got everything cleaned up enough to head back and actually managed a good pace in spite of it all!! I think this was mostly just a skin injury so I don't anticipate any problems tomorrow.