In response to Miss Cackle's request for a new alarm system, Frank Blossom builds one. When he comes to demonstrate it he suggests that everyone covers their eyes as it could get quite loud. The alarm is activated and the academy is filled with deafening...silence! The alarm appears to have a malfunction.... Later, in potions class, the second years are learning about finger sparks. Whilst applying the potion to their fingers Mildred gets distracted by Sybil who is outside the window having difficulty flying. Mildred spills far too much off the potion onto her hands! When it comes to her turn to practice her finger sparks she blasts a hole in the blackboard! Sybil has failed her broomstick test! But she has been told that she can retake it as many times as she needs to until she pasts, even though students are usually expelled if they fail the broomstick test! Ethel has been told to give her lessons. During lunch Enid decides to try the ""Semolina Bowl Trick"". When Miss