[quote=Gummi Bunnies]
Kaika can't really "die" anyways. Since she got her "Spiritual Pact," Kaika was tied to one fate, one expected ending. She isn't sure when she'll die, but fate had chosen a specific time and way for Kaika to die. So, basically, you can't kill Kaika before her fate or have her survive after her fate.
[/quote]

But what if Stein killing her IS her Fate?