Tuohy was the stronger runner and held back only from the need to insure a high finish for the team. However, she might not have made it to Valby had the latter run the shortest possible distance. I never even heard that phrase, run the tangents, until I was an adult coming back to running in my 30s, and the idea of running the shortest possible distance is a bit more complicated than that. Valby had not needed to run the shortest possible distance prior to this race because she was so much better than everyone else this year. But try explaining what 'run the tangents' means. I haven't seen anyone explain that here. To run the shortest possible distance, you will usually be hugging the curve and then running a straight line from there to the vanishing point of the next curve as soon as you can see it. Sometimes, then, you don't want to hug the curve because the next curve is on the opposite side (S curve, for instance) and you actually want to go about halfway/the middle and then turn toward the next vanishing point of the curve (the tangent). I was going to link one article about doing this, but there are many, so I'm just linking the search results. In other words, a lot of people have trouble with this and it really helps to know the course on a course like OSU, which she hadn't run before. With runners much better than everyone else they have faced up to a championship, you get stuff like this, not knowing how to run in a pack without being tripped and so wanting to front-run, not running the shortest possible distance, going to the front too soon. But just think of the potential here when or if she is able to run in the pack, to run 'the tangents', to run high mileage, to run a lot more hills, and to be acclimated to such conditions (all of which she admitted to missing).
https://www.google.com/search?q=explanation+of+running+the+tangents&oq=explanation+of+running+the+tangents&aqs=chrome..69i57j0i546l3.5193j0j7&sourceid=chrome&ie=UTF-8