Damn that ending was f'ed up! My legs were aching just seeing how fast they were running at the end of the marathon there, and then he slips on the logo and slams his head! I hope he crossed and is alright, that was painful to watch.
I know the paint on the track can be very slick when it's wet sometimes, I don't know why they put things like that when they're not needed. They're needed on the track, but putting the logo at the end, making it more slick was not needed.