A timed crack

After the whole debacle at Malfoy manor, Bellatrix Lestrange decided to visit her vaults at Gringotts. While checking on the cup, she ended up falling off the stool and cutting herself on a suscpicious artifact she inherited from her share of the Blacks. With it, she witnessed what would become of her and her master. Before she had any time to run out of the vault and alarm him however, the artifact started buzzing.In 1943, Professor Merrythought who taught the DaDa was randomly attacked and the year witnessed the addition of Professor Bellatrix Eccleshall.