So I'm just wondering if when you get online and see a friend is on Crota or VoG with an open spot on their fireteam do you ask if they need/want help or do you just join them? Personally, I always ask first. Even though they aren't set to Invite only or closed I just think it's polite. A lot of my friends can two man CE & I'd hate to mess up someone's flawless raider run or something like that. As a side note, if you are attempting flawless raider set your fireteam to closed. If you're just practicing lamps or bridge maybe set it to invite only.