No offense intended here, but from this question and 2 other ones, it seems to me that you're approaching officiating from a backward point of view. You're going to be a lot better off learning what is and is not allowed, and your definitions, rather than trying to disect how long half a step is, and worrying about which body parts can do what. Both defenders and offensive players have things they can do and things they can't. Learn those and you'll be FAR better off, and won't have questions like these.
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I was thinking of the immortal words of Socrates, who said, 'I drank what?'”
West Houston Mike
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