Why do you think Polanski at the end of the movie "The Tragedy of Macbeth", portrays Donalbin visiting wtiches?
The ending of Polanski's film is significantly different from Shakespeare's play. I think that Donalbain going to visit the witches implies that Donalbain will follow in Macbeth's footsteps. Donalbain will try to assassinate King Malcolm the way that Macbeth killed King Duncan. The cycle of violence will not end.
Thank you so Much, i really apreciate your answer, and yes that was my thought as well, it's just that i wasn't in class when they watched the movie, but that's the most logical asumtion that we can have.
While I agree with the explanation given by mrsmonica, I would like to suggest something more. Macbeth went to the witches' cavern much late in the play; rather the witches declared a meeting with Macbeth in the opening scene & they met him in act1 sc,3. In Polanski's film, Donalbain visits the witches; but there is no suggestion that the witches decided to meet Donalbain or actually met him prior to that. That is to say, Donalbain is not simply going to repeat Macbeth's heinous act, there is no provocation or temptation for the crime so far as Donalbain is concerned. Perhaps, the suggestion is one of further hardening of the ambitious mind: Donalbain needs no witches to cross the threshold, nor a Lady Donalbain as an accomplice.