This is how Thunderwing talks to Unicron goes in
Unicron: Thunderwing, what have you brought me?
Thunderwing: I have retrieved the Dark Energon magic, my lord, and the lavender Alicorn Princess of Friendship has been terminated.
Unicron: Then perhaps this day isn't lost after all.
Terrorcon: If that is true, it has been a while since anyone's been able to defeat an Alicorn.
Thunderwing: Because it has been a while since a follower of Unicron has been provided to do so.
Terrorcon: We may not know if...
Unicron: Enough! Thunderwing, are you certain the Alicorn named Princess Twilight Sparkle is exterminated?
Thunderwing: By my very own hand, Lord Unicron.
[Thunderwing is talking to two Terrorcons]
Thunderwing: You should've seen the Alicorn's face as her heart expired, knowing that she perished at the hands of a true warrior. Lord Unicron now understands that the best way to defeat a Princess is to send his most powerful follower.