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Punch the air?  Sure, go ahead, fine by me...~
$n starts shadow-boxing.~
You punch $M right in the face!!~
$n punches weakly at $N, missing by miles.~
$n tries a punch at you but misses by a good quarter-mile...~
Punch who?~
You punch yourself in the face resulting in your own nose being bloodied.~
$n punches $mself in the face, looking kind of stupid.~