Since there was a lack of potions masters in Great Britain, Severus applied at Hogwarts to be the potion professor and signed with the board a contract to be the potion master in Hogwarts and the head of Slytherin. Albus had tried to threaten him with his past actions as a death eater with Azkaban, but Severus retaliated even worse with the fact that he was an auror and could use his contacts in the DMLE to fire all of his pawns in the DMLE and that he had complete immunity for his actions that was signed by Amelia Bones personally and that he would charge him for blackmail with what he was trying to do. Dumbledore was stunned and furious. He was ready to curse Amelia for what she had done and there was also the fact that he was threatening him with charges. Albus was never treated like this, but there was nothing that could be done against Severus and he knew it. If Albus tried to do something against Severus, then all of his pawns in the DMLE would loose their jobs.