Once the last word has been acquired by defeating the hive enemy in a showdown, the drifter says something along the lines of: "don't trust the guy who gave you that gun" (as he is the guy that killed his friend)..... but, nobody gave me the gun. A hive enemy dropped the thing after trying to kill me.
I'm assuming he is referring to Shin Malphur... but it wasn't Shin, it was a hive enemy that had the gun.
Did I miss something or is this merely another area of the game where bungie decided to leave out the actual story and lore aspect of the quest?
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He probably was also hunting the weapon master, and when he felt our powerful light (which he had never been exposed to before) he probably felt it was best to give us his gun.