Patience is a virtue. The bouncer 'jumped the gun." This is hardly the first time a cop out of uniform has been shot by mistake. Apparently undercover cops have it the worst. Here is a Baltimore incident involving an on duty cop in civilian clothes that closely parallels the St. Louis shooting in that uniformed officers didn't know what was going down when they first arrived on the scene. Unfortunately, these things are over in seconds, and nobody gets their money back.
http://www.wbaltv.com/r/26427374/detail.html