Ran into a cool little bug today on the Family Reunion Alert. I was waiting for the iconic villain to show up for the Paradox Keeper feat, and found another group doing the same instance in the speedforce tunnel.
Yeah, that instance was always like that. The outside open world from the 2 alerts and inside the tunnel could have multiple groups going at it. It really helped when the content was new and the 2 roaming mini bosses outside were a pain to get down. There could be a ton of players trying to beat it.
