Mrs. Delacroix selected a stone so large she had to pick it up with both hands and turned to Mrs. Dunbar. "Come on," she said. "Hurry up." (76)
Mrs. Delacroix was such a sweet friend to Tess at the beginning of the story, but her true nature is revealed here.
"It isn't fair, it isn't right," Mrs. Hutchinson screamed, and then they were upon her. (80)
Mrs. Hutchinson is protesting only because the violence has become personal. She would have been perfectly fine with the idea of being one of the attackers.