Although there are real elements in the above citations, I will pay more attention to how the audience changes his behavior and their brother's interpretation, considering the personality of Bosola. Bosolas has many levels of personality and we encourage him to think that he is mentally unstable, such as killing the Duchess for his own interests and brothers. This is not to make him himself a corruption but a person who is forced to be in trouble. I am not sure about his actual situation.
Shakespeare was dissatisfied with the young prince Hamlet as frustrated, but Webster was complaining about the character of Bosola. In Shakespeare's Hamlet, the young prince was thinking very deeply about his father's death, so Hamlet implied "not only my cloaks" and the dark cloth reflected his dissatisfaction. Also, among Webster 's Duchess Malfoy, Antonio presents us with an explanation of Bosola' s character. This is the first opinion of dissatisfaction with Bosola. His existence is "a tragic age, and it is a good reward only to do this," he said. He was the first criticism of society and stated that there was no reward for doing anything.
Compared to Shakespeare's 'Hamlet', Webster considers Bosora the subject of revenge. "Who has to cut my throat?" He mentioned earlier about Antonio, but their brothers were both corrupt and did not reward any service. This role recognizes Bozzar's pleasure of "keeping your old melancholes". At the moment, Webster believes that Beausola will not recognize whether he is right or wrong. But eventually, when deciding to help Antonio, Webster gave Bosola a conscious role. "Oh, she left again: the rope of life has broken," he will retaliate against his brothers.