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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Wow...lots of Aholes wanting to "gank" the guardian. This is ridiculous lol...I doubt destiny is the sort of game with massive open pvp environments. Why would there be???? We are on the same side fighting earthling killing aliens -.- take your silly pvp to an instances battleground or arena and keep it FAR away from the open world. ANYWAY, If I wasn't doing anything important on my own, I could only benefit from tagging along (separate loot and all woot!) so yea...I'd raid alongside this fellow guardian