...We're not killing anyone, especially Mami, without any serious magical girl power.
"borrow" her gem.
But it's not like we can do anything with it.Also, I highly discourage the disposing of existing maical girls. We want them alive for Walpurgisnatch.
Dude, remember last time when Mami learned the true nature of Mahou Shoujos? She kind of went on a slaughtering spree. We do NOT want that happening again.
They are alive if we do that no?
Kazumi Magica pretty much confirms that in time, they DO die.
Regardless, we are NOT taking that gem. We have no chance of doing so anyways.
About chances. I have pretty much the idea of going with her home and talking about Magical girls... As far s I remember she shows her soul gem + there is a window in her room.. meaning that it is possible to throw it outside where Homura would be waiting...