Clip del Principe Mezzosangue (non trailer), Behind the scenes, anteprime, scene, spot tv, ...

Dumbledore - Harry, you must obey every command I give you. Should I tell you to abandon me and save yourself, you must do so. Your word, Harry.
Harry - My word.
Dumbledore - You know, at times, I forget how much you've grown. At times I still see the little boy from the cupboard. Once again, I must ask too much of you, Harry.

Michael Gambon - In this film, Harry is turning into a young man. The relationship, it grows into a friendship.
Dan Radcliffe - When Dumbledore takes Harry on this missing with him, he views it at sort of this rite of passage.

Dumbledore - Take my arm.

David Yates - In the Half-Blood Prince, Harry and Dumbledore, they go on this journey together.

Ron - Good luck, mate.
Harry - I don't need luck, I'll be with Dumbledore.

Michael - He takes him on to these dangerous trips.

Slughorn - Merlin's beard!
Dumbledore - Harry, I'd like you to meet Horace Slughorn.

Dan - They have to get this teacher, Slughorn, to come back to Hogwarts because he possesses this memory.

Dumbledore - This memory is everything. Without it, we leave the fate of our world to chance.

Dan - It's the final clue on how to destroy Voldemort.

Slughorn - Now, get out of here at once!
Dumbledore - That was fun!

Yates - This story is particularly about what Harry's learning from Dumbledore.

Dumbledore - This is a different kind of magic. Very dark, very powerful.
Heyman - What we're seeing in this film is Dumbledore preparing Harry for that ultimate battle.

Dumbledore - This time, I can not hope to destroy it alone.

Yates - Action!
Dan - This film is the best yet.
Emma - It's really exciting, there's loads of new faces.
Rupert - It's going to be really cool.
Heyman - There's an excitement, a thrill.

Arthur - Harry, no!
Dumbledore - Whatever happens, trust me. [...] The tale is thrilling, if I say so myself.