you do. >> but as she is about to pass sian, wendy falls.omen are just feet away from the finish line. >> and then wendy fell. sian got up, wendy got up. they tried to run, but they couldn't do anything. they were helpless. >> and as you can hear, my mom is, go, sian! and then her voice becomes panicked seeing that i have some major problems here. >> and she really was thinking, maybe i could die. you know. >> their bodies are breaking down in an anguished battle for fourth place. >> i was like, oh, this is so frustrating. i was like, come on. you see the line. you know you put so much effort into it. you just want to get there. that's when i'm like, i'm just going to crawl. >> like when you're a baby, you want that bottle, you just crawl to it. >> i just looked at her and i thought, that's what i need to do. >> after 140 miles and nearly ten hours it comes down to ten seconds separating them at the finish line. >> i just wanted to pull her across the line and hug her like we made it, we did it, we got here. >> when i come across the line we