NZ shooting spoopiness

Pic related shows a person running through a glass window?

He shoots at the pile of bodies and cleans up the stragglers in the middle of the room +the guy that rushed him, you never see him shoot anywhere towards that window, except one single bullet while that guy was rushing him, but that bullet dropped the guy. .

I'm wondering why, if this isn't CGI, nobody followed out that open window- he never shows that window for the rest of the video so we can't really see if it was broken, but we know he wasn't shooting blindly.