"and you shall go out there outside": and not in the camp.
(Ibid. 14) "And a spade shall there be for you among your implements (azenecha)": "azenecha" is the place of your weapons ("zaynecha").
"and it shall be when you sit outside": (One should ease himself) sitting, not standing.
"and you shall dig with it": I might think he digs with one and covers with another; it is, therefore, written "and you shall turn back and you shall cover, etc.": (which implies that he covers with the same spade).
R. Yishmael says: Whence is it derived that one should not turn his back towards the encampment (in easing himself)? From "and you shall turn back and cover your excrement," (which indicates that he was facing the encampment beforehand).