Violet switched foots while taking deep breaths along the way. She raised her hand to answer the next question. "Professor, a curse is the worst sort of spell a witch or wizard can do. It can cause much harm or pain to the victim and can be even very fatal. For example the sectumsempra curse Severus Snape had invented several years ago which causes what seems like an invisible sword that is slashed at the victim repeatedly. If not treated immediately, it can be deadly for the victim." Violet took a deep breath for explaining so much about this curse.