My LS has tried this twice now, both times for 3+ hours...
We plant 1 person in each of the 4 rooms, when the ??? pops at one, we run to it and kill. We clear all 3 Aerns out, but nobody ever gets the msg, and the ??? msg never changes either.
Do you have to kill different Aerns? Or is it always the ones in the room? Is it actually on some kind of timer? Quite confused.