In the end of act 3 we see a Hamlet who has made a terrible mistake by killing Polonius. Not saying that Polonius didn’t get what he deserved because in my opinion he was a snitch and a suck up to Claudius. But, we see that Hamlet finally got some courage to make a deathly blow to Claudius to no avail. The courage that Hamlet has desired, and expressed in act 3, has been suppressed once again. Until we reach the 4th act when Hamlet talks with Young Fortinbras’ Captain and how they were asking for permission to travel through to fight for a small piece of land. This battle that Hamlet contemplates gives him, in a way, more courage to take action.
Hamlet sees that it is in human nature to get revenge and fight for something no matter how small or insignificant. This revelation helps him make a vow to himself that “O, From this time forth/ My thoughts be bloody or be nothing worth!” (4.4. 9.55-6). He takes a stand that saying nothing he does or says from this point out is going to be anything but for his revenge of his father. I believe that this is a reinforcement of getting the courage to enact revenge. As we know, Hamlet is a character that sits on the fence. He sways back and forth from what he really wants or how he really feels, and this is something that even transfers over to be one of the most important parts of his life. This encounter with Fortinbras’ Captain is the final chance for him to get out, or for his plans to fall through. Even though he has been working at this, this is the last time he is going to get up the courage to act on his feelings.
Not only is Hamlet on a mission from here on out, but his actions have awakened fury in others as well. Laertes is an example of what Hamlet strives to be, vengeful on the drop of a hat. Laertes coming home is bad news bears for Hamlet because he has to watch over his shoulder. He escapes going back to England, which was certain death, and stays home, which is also a dangerous place with Laertes after him. These threats will all be resolved by the end of the play based on Hamlets certain enthusiasm for revenge and open mind to drama.