If it were someone else, including people from the Blood Skull sect, they might have been overwhelmed by the group of 30 undead. But the lady was wielding the power of lightning, which was the nemesis of corpses.
A single move from her dealt a devastating blow to the corpses. Lightning directly unraveled the corpses and crippled them at the slightest injury.
It was the sound of her lightning strikes that drew Arthur and the other two. But after watching for a while, they realized why she was running even though it looked like she had the upper hand against the corpses.
The main problem was that the three disciples from the Black Bones sect seemed to have an inexhaustible supply of corpses. If she damages one corpse, they will replace it with a new one immediately.
They didn't overwhelm her with all they had at once. But they kept the pressure up and slowly forced her to a dead end.
