For example, the Women's Pole Vault at NCAAs today started at 13'3.5" (4.05 meters), and then went to 13'9" and then 14'1", 14'3" and 14'5". If a vaulter is confident that they can clear the 2nd height, they will often pass on the 1st (lower) one to save their strength for the higher heights. The problem is that they sometimes get overconfident and pass on multiple rounds until their first height is one that they would normally clear, but can't get over that day for some reason. As a result, they "no-height", which means that they didn't clear a single height and automatically get last place. Baxter has consistently cleared 14' this year, so she may have skipped the first height or two, but the results website that I saw didn't provide the details. High Jump works the same way.