"You must have room to move" is no more ambiguous than "you have no room to move."
Viewing the entirety of the page on 293, I have to disagree with you on that one. In the former, one can interpret it saying you must have enough room to move. This is reinforced by the book suggesting that crawling (which implies you have room to move) through a 2 1/2 foot space is not enough room to move.
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