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Jon killed his fellow NW man Quorin Halfhand at Quorin's direction so that Quorin would not be tortured and killed for information and Jon would be accepted as a turncloak and could join the wildlings to get info. Quorin's last words to Jon were part of their NW vows reminding Jon that he is still for the NW but is just pretending to join the wildlings.
Remember that the wildling king, Mance Rayder, used to be with the NW, so it is not that uncommon for NW men to decide to live free with the wildlings. They don't make it real clear in the show, but Quorin Halfhand is supposedly the best swordsman and ranger in all the NW, so Jon killing him in a swordfight just gained him a lot of respect from the wildlings. Quorin probably let him win. In the book, Ghost is there to help Jon and bites Quorin's leg to distract him so Jon can kill him.
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