this is a description of Chapter 6 of Star Wars Episode 7 from Lego ABSW: The Video Game, the scene on Mustafar
(Daniel is on Mustafar with Ryan, when a strangely sinister-looking Tyler knocks Ryan to the pavement and takes his ightsaber. Daniel asks Tyler what he's doing.)
Daniel: TYLER! WHAT WAS THAT FOR?
Tyler: oh, i don't know, just THIS!
(Tyler jumps on Daniel, only to be thrown off, but landing on his feet.)
(Lightsaber battle begins, and Game starts when Daniel runs through a door)
(after you get to the cliff section, a second Cutscene starts, slightly lampooning the battle between Obi-Wan and Anakin, but at the end, Tyler turns out to be a fake Tyler, and not the real guy.)
Daniel: well, that makes me less sad to put you DOWN!
(Daniel tackles the fake Tyler, who is the same guy Daniel battled on Kamino to escape the Demon Sith Facility, a Demon Sith named Spanner. boss battle starts)
(after you win the Boss Battle, new Cutscene starts)
Daniel: so Spanner, i see you survived the Jedi's attack on Mustafar.
Spanner: of course i did! i am a Captain, and Captains are- AGH!
(Daniel cuts Spanner in half before he finishes his sentence, leaving only his lightsaber)