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Feel free to add me if you'd like, I can certainly help with the two old raids. Just beat the new raid for the first time last night so still getting used to that one
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On the joining fireteams subject, just send a message and ask if they have room for another or need another. I wouldn't go jumping into someone's fireteam without warning, just out of courtesy. Also If I see some friends playing together I'll check to see if they have a party chat going and jump in there to ask if they have room.