and then there were none

The empty gun. Isn't that Homura? Seems to be a missing tag.

I'm getting a feeling that Charlotte possessed Sayaka here. Dem head obsessions.

Final Killcount:

Homura: 3 (dat gunkata!)
Sayaka: 2 (off with their heads!)
Mami: 1 (and such a badass kill it was)

-- and here comes a chopper to chop off your head.