He went out with the leaders (14:54 at 5K), but then his second 5K was 15:55 and he dropped out before 15K (or at least I didn’t see a split for him).
For him to slow so dramatically so early, something must have happened. Maybe he was sick going in, or his stomach acted up, injuried/irritated something, etc?
Pre-race his agent was saying he was in good shape.