This is what happens . . .

[retired jerry]

all you would need to do is shield one foot

[Webfoot]

But anyway, wouldn't you need to obscure just one foot?

all you would need to do is shield one foot

Silliness aside now, what are you talking about? Surely seeing one boot introduces bias even if the subject doesn't know what the other one is. Am I missing the joke?

[retired jerry]

If you see only one foot you won't know if it matches the other?

Important to figure this out completely

[drm]

I know - always take over the boot gaiters! I think I even have a pair somewhere . . .

[Limey]

Go barefoot, problem solved.