One article I read said the lights were off.
It was 10 p.m. The victim could have been asleep and just woke, then whammo!.
Btw, if she's alleging it was dark and she saw the victim as a silhouette, then the victim likely saw the uniformed shooter as a silhouette as well.
That would mean the victim had no idea if it was a really a cop yelling at him.