This is how Optimus Prime vs. Soundblast goes in My Little Pony Transformers Prime: Equestria Girls.
[Twilight backs away from Soundblast]
Twilight Sparkle: What do you want with me?
Soundblast: Lord Unicron wants the magic from your Element of Harmony.
Twilight Sparkle: I'll never give it to him.
Soundblast: Then prepare to die.
[As Soundblast prepares to kill Twilight, Optimus, in vehicle mode, comes and his trailer smacks Soundblast away. Optimus transforms to robot mode and jumps and punches Soundblast. Soundblast looks up]
Optimus Prime: Soundblast, leave her alone.
Soundblast: I was wondering when you'd show up, Prime.
Optimus Prime: Whatever your master is planning, it ends here. Now.
[Optimus draws his chainsaw in his right arm and his rocket launcher comes up his right shoulder]
Twilight Sparkle: Optimus!
Optimus Prime: Twilight, go!
[Optimus and Soundblast fight as Twilight runs]
Soundblast: Twilight is weak. She always was.
Optimus Prime: Twilight is more than just a weakling. She is caring, friendship showing, tough, and special. She is the source of my strength. She is part of my family and always will be. But more importantly, she and I are like brother and sister.
[Twilight stops upon hearing this]
Optimus Prime: And she will always be there. And no matter what, I will always protect like the brother I am to her.
Optimus Prime: So, that's why we're friends.
[Twilight starts tearing after hearing all this]
Optimus Prime: This will end.
[Then to everyone's surprise, Optimus' trailer transforms into a winged jetpack and Optimus merges with it and flies into the air]
Optimus Prime: Your plan ends here, Soundblast.
[Optimus then fires his guns at Soundblast, overpowering and weakening him]
Optimus Prime: Goodbye, Soundblast.
[Optimus fires and Soundblast dies]
Optimus Prime: Honor to the end.
[Optimus lands and Twilight comes over]
Twilight Sparkle: Optimus. Why didn't you saw this earlier?
Optimus Prime: Because