Based this story around a scene from the pilot of the TV show Birds of prey between Harley Quinn and one of her minions.
Sebastian was terrified. The plan had failed he had failed and he knew she wouldn't be pleased with him. But how could he still go along with her? Having being a factor in a kids attempted suicide. He wasn't evil like her he wasn't…insane like her. Sebastian had to stop all this. She was where she said she would be. Harmony stood on her schools stage. Sebastian hesitantly walked up to her. She turned to face him a disappointed look on her face.
"Harmony I'm …" she silent's the warbler with the raising of her hand.
"Well Sebastian this is quite the disappointment." Harmony started.
"I needed Kurt and Rachel gone Sebastian. I had a dream of New Directions writhing in pain dying on the ground everything under my command. And you…RUINED MY DREAM SEBASTION!" Harmonies expression and tone were manic like a savage beast. She spun a round quickly and kicked Sebastian in the face. He fell on his back. The boy was unconscious a bloody gash on his forehead. As she looked down at him Harmonies face softened and became a dark smile.
"At least temporarily…what happened Sebastian I wish you could tell me because New Directions stopped you and that means there trying to stop me." Harmony had observed Kurt, Rachel and New Directions for a while. She knew they were good and felt they were all a threat to her. She was to win nationals and she was to go to Nuyada and become a star not those two or the rest of their friends. Harmony figured the best way to destroy them was to go to get to Kurt. With Kurt hurt by Blaine betrayal with Sebastian it would affect his stepbrother Finn and then Rachel and that would spread to the others because they all loved each other like a family. It disgusted Harmony to think about that. When she told Kurt that the next years competition would be a blood bath she savored the fear in his eyes. Harmony had found Sebastian in a chat room for singers and learned he was moving to Ohio. She convinced him to go to Dalton and then sprang her plan into action promising if Sebastian did what she said he would get everything they both wanted. Her plan had failed. Blain was too loyal...to disgustingly noble. She then convinced Sebastian to attack Kurt with the tampered slushy. Harmony was disappointed she couldn't be their. Kurt looked like a screamer but Blaine getting hurt was good enough. But New Directions had won and now they were moving ahead over coming every obstacle. Of course, Harmony had other methods and many contingency plans. The sophomore girl spoke once more.
"It just goes to show you… never send a Warbler to do a Psychopaths job." She giggled with her misleading schoolgirl charm and walked away leaving her former henchman limp on the floor.
The end.