Guards are easy to aoe or single target down, as for players, I was pretty lucky on my Varian fight with how i timed patiently getting in there, and only got 6 honorable kills while fighting him, as seen in my video.
As for Tyrande and Velen, there are usually not many players there anyway, and they are normally smart enough to stay away, at least if you show them you are paying attention and can handle them if they attack.
Magni I haven't even tried yet, as there are always too many players in Ironforge for it to be worth the bother for me, and his abilities are nasty enough without any meddling players.

But yes I do try to pull them to a spot that will have less npc's calling for guards.