We did this last night. An opposing faction was attacking NP. The dudes were flagged for PVp. So my buddy sent in there and aoe taunted to take less damage. This pulled the boss and killed him instantly, but then they all got mad and said they were reporting bla bla bla.
My thought was, don't be flagged for PVp when fighting an open world boss.
BW won't do anything about that. It is a contested zone, open world, etc. This was their design intention.
As mentioned in the multiple previous threads, Nightmare Pilgrim is only an issue for same faction griefing. One person can wipe the entire raid repeatedly.