Hill didn't even know if the Temporal Artifact would choose to stop those bone-diggers.
Previously, Hill might have thought that aiding Mirabar wasn't as important as stopping Bane's followers, but after realizing why the Temporal Artifact valued those dwarves so much, Hill changed his mind.
Although the necromancers regarded Mirabar as bait to attract Luskan's defensive forces, to the Undead Tribe and Hill, this bait was what they truly desired.
Even if letting those necromancers escape didn't matter.
So before the Undead Tribe became Mirabar's saviors, they couldn't take out the necromancers here first... otherwise, the threats to Mirabar's safety would just flee directly, wouldn't they?
Hill didn't even mind letting them dig into the veins...
The Undead Tribe soon launched a second wave of frenzied attacks, and of course, there were some taking advantage of the situation to get online.