Originally Posted by
Thirtyrock
Blizzard explicitly stated you would still be able to opt in to pvp without opting in to war mode. They knew this situation existed and are OK with it. It wasn't an oversight, they chose to do this and therefore allow this to continue.
You don't like it; that's fine, but it's not a bug, and it's not an oversight. It's intended. Move along.
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Were you unable to flag yourself? That would certainly be a bug. But if he's flagged (Attacking NPCs = Flagged) then you can flag yourself and attack.