What I like to do is if player A has more than 4 mobs on them, and Player B pulls a single off. I would rule in the favor of player B. If I see a bard swarm kiting and I notice lag in the zone, I ask them to knock their numbers down. I'll check back and if they are still kiting larger numbers, I tell them to leave the zone.
You are responsible for your kite, if your kite kills someone, then we have a problem. It's reckless behavior and disrupts people's fun. You're lucky, I wanted to cause people to go LD, and let them die after a warning, but Senior Guides told me no.
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Swarm kite all you want, just don't do anything to disrupt other players, it's simple as that. I don't want to see any swarms coming remotely close to another player's camp(looking at you DL wall). You are all over the place, it is your responsibility to have control of your mobs. I'm tired of the "well they shouldn't have gotten in the way".
It all falls under fair play and frankly, just don't be a douche. In the example of City of Mist, I would have told the bard to leave the zone.