I was thinking, it doen't make any sense that organized armies like the Charr, White Mantle, etc would engage you only one group at a time, while their friends are within eyesight.
It'd be interesting if for every mob, they added a mob that acts as a shouter. Basically, when you pull a group, they'll come over to investigate, and when they've discovered that you're there, they'll send their caller to alert the nearby groups. The caller can be any member in the group, so you'll really have to watch which one runs away. You basically have to kill their caller to avoid getting any more aggro on you.
This would make ranged classes that can slow down enemies like Rangers and Mesmers more wanted in public groups. This would also make the game more challenging and it'd make more sense too =P
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