Macbeth Response Act Three

Macbeth Response
Act Three
Scene one of act three was really a shock to me. I just cannot comprehend why somebody would kill their so-called best friend, just on a hunch that they suspected them of murder. I had predicted that Macbeth would not go through with the murder, but I was proved to be wrong in act three when the murders did in fact kill Banquo but failed to kill Fleance. I was actually really pleased that Fleance got away. The thing that I am still confused about is who is the third murder? It is obvious by the dialog between Macbeth and the third murder that they know each oth…