I just completed Winter's Run so I could satisfy the "Aksor, Archon Priest" Vanguard bounty, but it shows incomplete even though I completed it with two other players. This is not the first time it has happened, either. I've had this happen on the daily & weekly missions too.
Do you think you might be addicted to playing Destiny? Yes/No
Is it so over-the-top in minutia it is turning everyone into obsessive-compulsive players? Yes/No
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Did you damage Aksor within the last 30 seconds of the strike?