This is how Thunderwing's defeat and Twilight's release goes in The Return of Thunderwing.
[We see Thunderwing weakend and about to be beaten]
Thunderwing: Twilight, help me!
Twilight Sparkle: Yes, my friend.
[As she flies towards him, Shining Armor readies his magic]
Thunderwing: Oh no you don't.
[Thunderwing blasts Shining Armor]