The shooter could have been farther out, under cover (sniper) or on a rooftop.
Granted, that's speculative, but we still don't have ballistics data.
It is interesting that this guy didn’t see anybody in front of him, but knows he was shot by police when he was standing next to Boyett. Boyett’s step son states almost immediately after the incident that he saw Boyett shot by a guy in Bandido colors.