[lizma2]

Don’t you think if he would fired a warning shot, she would have backed out of the window right quick?

[AndyTheBear]

I suppose. But he decided to murder her instead, and that made her fall out of the window as well.

But he didn't need to shoot a warning shot to get her out of the window. He could have just shoved her out of the window. He could have stepped into her field of vision instead of sneaking up on her from the side. He could have yelled, like he lied about doing.