Why would Blizz add PvP and not Battlegrounds?

[savaughn]

Because the manual says that on a normal server, besides typing /pvp you'll enable your pvp flag by:

"Attacking an NPC of an opposing faction [...]"

"Attacking an opposing player that attacked a friendly NPC"

"Aiding a player engaged in PvP combat"

"Entering an enemy capital city"

and I don't think Mind Vision counts as any of those.  I don't actually think Detect Magic counts as any of those things, either, and I'd say that that shouldn't flag you for PvP either, although that's a bit more of a borderline case (and puts you into combat, I suspect: I don't know, though).

I don't mind that it does flag me now that I know about it, but the manual is at worst wrong, and certainly misleading, since Mind Vision is _not_ an attack because it doesn't put you into combat.
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Mind Vision and Detect Magic are information gathering spells that give you an advantage and thus flag you for PvP - falling into the "aiding a player" category. Similarly, the Hunter's Mark which does no damage in and of itself flags the hunter for PvP, so on and so forth. If you cast a spell of any sort on a PvP enabled individual it is assumed that you did so for a PvP reason and you are flagged.