But if you're just going to sit AFK in Legend Haunted Lost Sectors until the boss spawns, at least do it in a full fireteam so you aren't, y'know, actively griefing your teammates.
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It is an activity with no fail state. Why even care if someone is going AFK. 9/10 times a MM team can't even kill 5 headless ones before the boss spawns. So it is not like them going AFK until the boss spawns is making the activity last longer.