what’s the adage anyhow? flee a blade, but charge a gun? someone who was indignant enough, even with no gun himself might do something the shooter never would expect — charge the shooter, risking getting shot but being a difficult target while in motion. knock the bastard over then call everybody else to pile on while trying to wrest the gun away.
Nah - just unholster your .45 and pull the trigger.
Easy.