David Graeber's essay in which he presents a triadic model of bullying.

"We should imagine instead a three-way relation of aggressor, victim, and witness, one in which both contending parties are appealing for recognition (validation, sympathy, etc.) from someone else. The Hegelian battle for supremacy, after all, is just an abstraction. A just-so story. Few of us have witnessed two grown men duel to the death in order to get the other to recognize him as truly human. The three-way scenario, in which one party pummels another while both appeal to those around them to recognize their humanity, we’ve all witnessed and participated in, taking one role or the other, a thousand times since grade school."