Stolen Video

So I got a PM about a video of mine being stolen.
This is their video: https://www.youtube.com/watch?v=jLZ1m_u1AY4
And this is mine: https://www.youtube.com/watch?v=fttEbpaG7bI
They zoomed in on my video to get rid of the watermark and added their own, and changed the music.
Does anyone know what to do in this situation? So far I just asked them to take it down.

EDIT: They took it down

Good thing the person took it down, most video thieves don't care because we technically can't do anything about it :/

I missed which video & Channel it was, but there's alot of drama with the videotheif "DreamerPrincess" at the moment. She's truly something special.

Yeah she's one of a kind -.- And she steals from like EVERYBODY, holy hell DX