Harry Potter:" Incarcerous! Fight back!, you coward! Fight back!"
[Bellatrix shoots a curse at Harry]
Severus Snape:"No! He belongs to the Dark Lord!"
Harry Potter: "Sectumsempra! "
[Snape blocks the curse again, throwing Harry onto his back]
Severus Snape: "You dare use my own spells against me, Potter? Yes. I'm the Half Blood Prince. "