Handguns by nature aren’t very accurate outside of several yards, even with a trained stationary shooter and stationary target. Add in the fact there was a moving active shooter, police that were on the run/moving while returning fire, and the intensity of the situation itself, it’s not hard to see why a relatively low percentage hit target. I’d bet the vast majority of the misses are lodged in the car. There didn’t seem to be much else going on in the background as far as potential collateral damage. The misses fired from handguns pointed at the angle the cops would have been shooting at would have likely impacted the ground within 50’ if I had to guess. The ones that didn’t hit the assailant or the car.