Unattackable Players in PvP?

[Solarverse]

This was not a thing when I last played. However, players, even in Warburg, are unattackable.  What is going on? Do they have an option to not be attacked in PvP now?

[PaxArcana]

... are they on the same "side" as you?

 

Do they perhaps have a power that renders them immune to attack (e.g., Personal Force Field) ...?

[Solarverse]

... are they on the same "side" as you?

 

Do they perhaps have a power that renders them immune to attack (e.g., Personal Force Field) ...?

 

In the case of Bloody Bay, no. He was not. In the case of Warburg, yes. Both Heroes. However, in Warburg, it's a free for all, everyone vs everyone. So alliance should not matter.