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It's something to do with one of the raids, as there's 6 in your fireteam. Two were close enough? Only two made it but you were all alive?.. I'm gunna guess you saw [b]Atheon[/b]. Two of you were holding the gates, the rest were at the top of the stairs/dead so weren't close enough when the conflux disappeared (this could be why one was dancing, due to beating this section of the raid). To be honest, I have no idea.