Quote 19
I felt a second of pure despair, alone in the middle of the wide marsh, under the fast-moving, stormy sky, with only water all around me and that dreadful house the only solid thing for miles around. (10.28)
A lonely guy in a lonely house in a lonely marsh... we are so glad we're not in Arthur's shoes right now.
Quote 20
It was one of what I can only describe… as a desperate, yearning malevolence… (5.24)
Hell hath no fury like a woman scorned, and the woman in black has definitely been scorned by someone. So expect some fury.
Quote 21
Moreover, that the intensity of her grief and distress together with her pent-up hatred and desire for revenge permeated the air all around. (11.72)
The woman in black wants to make someone, anyone pay for what she's been through—and she wants it so badly that it leaves a mark on the whole house.