The giving of the blow
Then the Green Knight swiftly made him ready, he bowed down his head, and laid his long locks on the crown that his bare neck might be seen. Gawain gripped his axe and raised it on high, the left foot he set forward on the floor, and let the blow fall lightly on the bare neck. The sharp edge of the blade sundered the bones, smote through the neck, and clave it in two, so that the edge of the steel bit on the ground, and the head rolled even to the horse’s feet.