I think the fear is that the ground underneath is soft and too heavy a footstep and the poor chap will have to find out what lies below! Fortunately for us, we got out unscathed but that walk reduced our average pace to 7.5mins. Oh well!
There organizer had also thoughtfully provided each runner with a small towel to wipe ourselves. Our medal was a nice piece of fridge magnet that had our finish position on it. What a great touch!