druid hallmark quest, any help?Follow

I'm doing the part in Vermin Snye where I have to find bloodsabers who are trying to resurrect sir wembly, when I enter Vermin Snye and go a bit down the entrance at top of stairway, I always get jumped by 2 bloodsaber adepts, level 15. They totally own me, yet I'm level 19, hitting me for upwards of 70+. I use most of my mana on self-heals, sneaking in a dot and dd between heals, then run for zone when almost dead. I can't kill even 1. I don't understand this as I've been told that hallmark quests are supposed to be soloable and I wasted the bloodsaber adepts in down under during the first part of this quest. Any tips or explanations of what is happening here would be greatly appreciated. Thanks in advance.