Maybe she said I’m going to stab you.
This is a question better asked of him than me, only he knows that answer.
That being said, his getting up and, by extension allowing her to get up, is not a crime, nor is it in any way an action that forfeits his right to self defense.
Maybe you're getting ready to put words in the dead little girl's moth.
Maybe she said: "I'll be back.", like Arnold in The Terminator
Maybe that's why the murderers had to unleash a hail of bullets inside the police station.