Found this on accident/out of curiosity. Friend asked “hey, do you think you could reach that ledge over there?” And now here we are. When you reach the first group of ads and you “cleanse” the first little beacon that opens the portal, you can look off to the side and see a balcony across the large gap, which is where you actually come out of the portal on the other side. There is no “Turn Back”, repulsion, or instant death barriers blocking anyone from skating or using some other method to fly over. Once you do, however, it counts as strike progress and immediately despawns any and all ads inside the portal area itself, including the chieftain, subsequently preventing the exit from appearing and effectively locking other players from progressing. The only way to get said players out of the room/caught up is to either wipe in the darkness zone further in, or to get to the boss encounter itself.