AFAIK there is no rule that allows you to take mobs from a player that is actively kiting or has them agro'd. In fact any such rule would render one of the main strategies that bards use to level completely useless. Doing so would fall sqaurely inside of the definition of kill stealing and therefore would be a punishable offense.
1. You may not steal kills.
Kill Stealing is defined as the killing of an NPC for any reason that is already fighting or pursuing another player or group that is prepared to engage that same NPC without that group's specific permission.
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