At SF 2015, he screwed up the time checks.
He missed the 2.3 mile checkpoint
Then overall 6:45 pace at 5.5 mile check
But then the overall average pace slowed to 7:15 by the 7.5 mile checkpoint meaning about a 9 min pace for those 2 miles
Then over the next 5.8 miles he averages 6:08.