Kind of like how a wormhole can bend space to make "FTL" possible, without actually having anything moving faster than light. Only this time, instead of folding the third dimension through the fourth, it's folding the fourth dimension through the fifth. Behaving as a square rather than as a line.
If Puella Magi could Mankai, I imagine Homura would be able to translate sixth dimensionally, which would make her capable of existing in several separate timelines simultaneously without breaking coherent form... Which I'm not entirely sure what would look like, but probably would end up with Firn writing something like this:
Code:
AHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
HHHHHHHHHHHHHHHHHHHHHHHHHHHHH
Homura fixes everything and nothing does nothing wrong before failing and succeeding simultaneously kissing Madoka and bowing out of reality as your new deity of snack burritos in the manner suitable of a woman who's age equals one over zero.
If you want to imagine what that sounds like, just imagine the noise your computer made when you first got Gary's Mod and decided to detonate a stellar-sized mass of explosive barrels simultaneously. Hold that in your mind. Now, separately, take the Earth, and take VY Canis Majoris. This is your new comparison - compare the noise of your computer to the noise the universe made when Homura translated along the sixth dimension, to your comparison of the Earth to VY Canis Majoris. They are equivalent ratios.