Harry Potter and the Half-Blood Prince2009

Albus Dumbledore:
Good evening, Draco. What brings you here on this fine, spring evening?

Draco Malfoy:
Who else is here? I heard you talking.

Albus Dumbledore:
I often talk aloud to myself. I find it extraordinarily useful. Have you been whispering to you yourself, Draco? Draco, you are no assassin.

Draco Malfoy:
How do you know what I am?! I've done things that would shock you!

Albus Dumbledore:
Like cursing Katie Bell and hoping that, in return, she would bear a cursed necklace to me? Like replacing a bottle of mead with one laced with poison? Forgive me, Draco, but I cannot help feeling these actions are so weak that your heart couldn't really be in them.

Draco Malfoy:
He trusts me! I was chosen! [reveals the Dark Mark on his left arm]

Albus Dumbledore:
I shall make it easy for you... [raises his wand]

Draco Malfoy:
Expelliarmus!

Albus Dumbledore:
[wand flies out of his hand] Very good, very good. [door opens in the distance] You're not alone? There are others? How?

Draco Malfoy:
The Vanishing Cabinet in the Room of Requirement. I've been mending it.

Albus Dumbledore:
Let me guess; It has a sister? A twin?

Draco Malfoy:
At Borgin & Burke's. They form a passage.

Albus Dumbledore:
Ingenius. Draco, years ago, I knew a boy who made all the wrong choices. Please let me help you.

Draco Malfoy:
[breaking into tears] I don't want your help! Don't you understand? I have to do this! I have to kill you! Or he's going to kill me...

Bellatrix Lestrange:
[walking into the astronomy tower followed by Death Eaters] Well, look what we have here. Well done, Draco!

Albus Dumbledore:
Good evening, Bellatrix. I think introductions are called for.

Bellatrix Lestrange:
Love to, Albus, but I'm afraid we're on a bit of a tight schedule. [to Draco] Do it!

Fenrir Greyback:
He doesn't have the stomach... just like his father. Let me finish him in my own way.

Bellatrix Lestrange:
No! The Dark Lord was clear; The boy's to do it. This is your moment. Do it! Go on, Draco! NOW!

Severus Snape:
No. [steps in]

Albus Dumbledore:
Severus... please.

[short pause]

Severus Snape:
Avada Kedavra!

[The spell hits Dumbledore. He is knocked over the rail behind him and falls from the tower]