That’s me. In a raid group with one other person so I could run into Karazhan for two minutes.
And that’s… that’s another raid group in the same instance with me.
After a lot of confusion and pondering over whether we actually could 11-man Karazhan, the one final member of the other raid group realized he couldn’t get into the instance because the “raid was full”. Ah, so that was it. Ten people with the same Raid ID can all get into the same copy of Kara, regardless of groups. That’s how it seems, anyway, because I’d earlier been called in to help on Curator with two of these people a couple days ago… so I was, in fact, sharing a Raid ID.
Still, I can tell you right now, after months of playing this game, it is downright surreal to be in an instance all by yourself and suddenly run into a bunch of other players.