How to do it deep in the underground hall?

Players need to investigate the apprentice Osterkig to get information.

The deep task of the underground hall is to pick up the task at the Bones Witch (coordinates: 32.5, 43.0) of the Iceberg Glacier, and then find the apprentice Osterkig. At first, let him hit you, but you don't hit him, then call him again when the complaint is repeated, and then call him slowly. When the blood volume reaches almost 20%, the task is completed.

Task description:

Deep in the underground hall in the northeast, there is a Frankenstein named Dr. Horror, who is secretly planning an action that matches his name.

As you know, those useless Viku people who died in battle will become "Wagu". Dr. Horror was ordered by the Lich King to experiment with this natural disaster warrior named "Wagu".

We must stop his research, but my divination can't find out his whereabouts. Fortunately, Dr. Horror has an assistant.

I want you to investigate his apprentice and get the necessary information. If he notices, you can beat him up and come back soon.