This is how Celestia vs. Twilight: Immolation Scene goes in My Little Pony: Nightmare Moon's Revenge.
Princess Celestia: I have failed you, Twilight. I have failed you.
Twilight Sparkle: I should've known the Elements were plotting to take over.
Princess Celestia: Twilight, Nightmare Moon is evil.
Twilight Sparkle: From my point of view, the Elements are evil.
Princess Celestia: Well then you are lost!
Twilight Sparkle: This is the end for you, my mentor.
Princess Celestia: It's over, Twilight. I have the high ground.
Twilight Sparkle: You underestimate my power!
Princess Celestia: Don't try it.
[Twilight jumps but Celestia blasts her. Twilight lands on the ground and looks up at her former mentor]
Princess Celestia: You were the chosen one! It was said that you would destroy Nightmare Moon, not join her! Bring balance to Equestria, not leave it in darkness!
Twilight Sparkle: I hate you!