His quick temper helped lead to his 'undoing'.
The incident resulted in her 'undoing'.
My quick temper 'was my undoing'.
(..) one has come of age, fairer even than you. She is the reason your powers vain. - Who is it? - Snow White? Snow White? She is my undoing? - I should have killed her when she was a child. - Be warned, her innocence and purity is all that can destroy you. But she is also your salvation, queen. (..)2012 Snow White and the Huntsman