This is literally exactly the same as casting a curse. The three fold law is Wiccan dogma not a law of physics, so there is not bad karma for cursing. This is not even how karma works. Stop being holier then thou!
In Buddhism, the “four great elements” (Pali: cattaro mahabhutani) are earth, water, fire and air. Hinduism adds a fifth “great” or “gross” element. Air – moves us Fire – transforms us Water – shapes us Earth – heals us shares