"Apparently not." Loki kept hold of his brother's arm with one hand and hovered the fingers of the other over the cut, which insisted on dramatically welling blood. A faint green glow shone off his fingertips as magic investigated the wound.

He could see how to widen the wound, use a form of illusion to deaden or enhance the pain, but actually repairing the split skin and flesh? Loki frowned.