Originally Posted by
Espada
Pretty sure you can kill them in normal and go for Hagara. Although I would try Yor'sahj a bit and get a feeling of how hard he is (since once you start with hagara there is no turning back that week). I suppose it will depend on the time needed to kill Morchok HM.
By the way, heroic Yor'sahj... It does feel like purple>yellow>green>blue, right? At least I think the yellow becomes much more dangerous in heroic, where it empowers void bolt+two other abilities (unless you get either blue or black, which are not improved by yellow).