Fagan was at the front of the pack from the start (or, at least, from the first posted split of 2:59 at 1k) and stayed there until the 4000m split at 12:23; at 5500m, though, he dropped 18 seconds (the leaders, whom he was with at 4k, are at 17:02 and he's at 17:20) and 21 places (from 2nd to 23rd). From that point on he basically hovered between 23rd-30th before eventually finishing in 24th.
That doesn't look like a normal fade; almost all of the places he lost were in one 1500m stretch in the middle of the race before things really opened up. Does anyone know what happened? Did he lose a shoe? Fall? Cramp up badly?