They are a different race and class, and you've never met them before. They're headed straight for a very difficult dungeon, and you're not doing anything particularly important. This guardian also has a microphone and speaks your language.
What do you do?
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No announcement has made me happier than learning "ganking" won't be possible! No assholes/pansies sniping me while I'm finishing up a quest or when a boss I've been fighting for 10 minutes has 2% health left =D thank you bungie for not giving control of this game to mass of jackasses and Dbags that will undoubtedly play =)