I have a bad theory(as in poorly done). In the comics, the vahi can open rips in the time space continuem, and banish beings to the past. Tahu nuva does so to the bohrok kal and the bahrag, and the toa say "la dee da dee da, everythings ok" and go out of the cave. however, the time portal is still open, and out comes, dun,dun,dun, Makuta's old self. And that's about when Takua finds the MoL, and this whole goosechase starts for a 7th toa, and Makuta creates the rahkshi, and in the end gets to have six pets who have powers that remind american canadians such as myself of the apocolypse and love the word "rahk".

the mask of time only stops time, just so you know.

Yes, that is quite poor.

Anyway, the Vahi can't open rifts in the time/space continuum, it can only slow down time, and maybe speed it up.

I knew that, I said it was a poor theory. But, there is a real theory that if you could go faster than light backwards around the earth, you could go back in time. Don't kill me, it was in the news.