Hesitation

        Hamlet, with weapon in hand, stumbles upon the man he must kill in order to avenge his father's death in the most vulnerable and unsuspecting of positions. Naturally, then, he walks away and decides he cannot kill him at this time.
        Not long after, while speaking with his mother in her chamber, he notices a figure hidden behind the curtain. Why, that must be his evil uncle! He doesn't need to double check, he made the clear choice to kill him right through the curtain.
        These two scenes show the evolution of Hamlet's character and conviction. Initially, he hesitates to avenge his father's death, wanting all the facts before he jumps to any hasty conclusions or does any rash actions he may regret later. He comes up with incredibly indirect means to try and find proof of his father's murder at his brother's hand. However, by the second scene in his mother's bedroom when he kills Polonius behind the curtain, believing him to be Claudius, Hamlet has changed and we see exactly how far he is willing to go for revenge. This is the point of no return for Hamlet; not only has he killed an innocent man, but the man he truly wants to kill is onto him, and Hamlet is hesitant no more. He is prepared to kill Claudius.