I noticed this a few days ago with a friend and I playing together. It was the first time I teamed up with him and we are using whirlwind barbs with the wyrdskin charm. For some reason the charm this season is effecting the other players not just enemies. I can see myself going vulnerable and weakened when he’s nearby and same for him.
not only that but it’s also causing an issue where if thorns is present on anyone’s gear near by you are taking huge damage by using challenging shout (may be other powers too but that’s doing it for me). Originally I thought it was only when teamed up in a party with other barbarians running the charm but I just did a realmwalker event and another barb clearly had thorns as every time I used the shout skill I instantly died. The combat logs even listed the players name as what killed me when doing so.
Both of these issues went away when removing the wayrdskin so it’s definitely tied to the charm. As such it can lead to trolling if players were so inclined by simply throwing thorns on gear and standing in event spaces and watching barbs die over and over to their own powers