So here’s the thing; absent a tracer round, it’s just really, really hard to see supersonic bullets in flight, even in daylight. Knowing what angle they’re at at night, sorry, no.
My grandfather was a police Chief. One day, in their infinite wisdom, the powers that be issued an edict that the police were required to fire a warning shot.
This was in the days of the .38 revolver being standard issue. In the morning pre-shift briefing, his officers were instructed henceforth to visit the range prior to going on-shift so that they could fire their warning shot.
Today, I was pondering what California would look like after another 10 years of rule by the current Supreme Soviet. Upon reading this, I realized there was already an answer to the question.