Cool, although, 1 legged man?
I suppose one side of the track couldn't simply have been drier? Or the boy/girl/man/woman simply hopped on one foot?
Im sure they tended to loose legs too, but i don't think it is the only explanation.
If I am walking and get one foot on solid ground, and the other in the mud, I shift over to get both feet on solid ground. It's pretty much automatic. I can't imagine anybody intentionally walking with one foot in the mud and the other on solid ground. Unless, of course, that person was intentionally trying to confuse anybody who saw his footprints, as a joke... ;-)