So long as the shaman doesn't nuke/dot/do combined damage that exceeds 51% of the mobs STARTING hp. If you do, you KS the necro.
This is how I've been PLing my 20 Necro:
--group with her before pull, cast Puma on pet.
--disband just as she pulls.
--let necro do her thing til mob hits 49%.
--send in dogdog at 49% so mob dies very fast. Meanwhile, necro has gone to get another mob when current mob is at 70%, to maximize time on Puma. New mob rolls into camp just as first mob hits 50ish if I time it right. Dogdog goes after current target, necro tanks new mob until first one is dead, then backs off (good way to work on Defense while she's at it.
I can kill 3-5 mobs per Puma, and after it expires, I just group necro and refresh, then disband again. It works fairly well for me.






