"It's okay if you don't transform."
"I can feel an even sharper killing intent than when you transformed"
There are also some other awkward sentences that could be easily fixed. Seriously, these chapters need some QC, just comparing it with the anime lines would do wonders.
Translators, on Page 12, is it possible that instead of the spirit dissipating, it's the high-density magic their body is made of, ether, that evaporates?
The light clan reminds me of the Nazi scientists, it sounds like at some point with nothing to do since the dark clan were no threat they started experimenting with the humans they empowered and found a way to make them more powerful while also making them unable to ever leave the clan since they would slowly die. Even ancestor seemed slightly concerned for the magical girls.