You walk in facing forward, not backward, that means he starts at front.
Our backs are to the wall in this fight :)
English
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My friend says back because he spawns at the back of the room
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I'm sad to say, your friend is wrong. although, if you were to speak using 3d space there is no back, forward, side, up, down etc, only coordinates. but even by this reckoning, your friend is still wrong.