Depends on if they actually handle this in a 'first aggro' way or 'first damaged'.This is like one of the few possible benefits of the rule. Your PBAoE's shouldn't hit the mobs unless they FD.... for 15 seconds based off what Niente.
"Additionally, this server will be our first attempt at encounter locking. In short, once an NPC is engaged, it will be locked to that character, group, or raid. Characters not part of the lock cannot contribute damage. Spells from outside characters will not land on the NPC. "
If you don't damage the NPC, does it lock? That is an important distinction - damage vs aggro.
In EQ2, you could run around with unengaged NPCs and walk them up to people whom would engage them via pbaoe.
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