Toughest leg on the WOC women's middle final?

You can make a case that the leg to 14 was the hardest leg on the entire course for the women's middle final at WOC. I was looking at the splits in WinSplits Pro. I looked at the "performance index" for each leg on the course. Performance index is the average of the fastest 25 percent of the split times divided by the specific runner's split time. The higher the number, the better the runner