Dude, even blind, deaf, African bushmen know that race walkers don't actually keep one foot on the ground. It even says in the rules that they just have to appear to do so with the naked eye. Your slow mo videos are pointless.
The Loper is right here (not about the African bushmen bit but we can forgive him that ;)).
That takes nothing from the poster that wrote after him. It's a ridiculous sport.