Maybe he accidentally pulled the trigger? For example Remington 870 Police uses heavier sear spring to prevent such accidents: "Finally, there is the police sear spring that gives the shooter a heavy trigger pull of around five to eight pounds. This makes the trigger of the shotgun harder to pull, but that is the point because it is much safer and reliable to handle." from http://www.rem870.com/2013/08/13/10-steps-to-upgrade-your-remington-870-express-to-police-version-2/
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Maybe he accidentally pulled the trigger? For example Remington 870 Police uses heavier sear spring to prevent such accidents: "Finally, there is the police sear spring that gives the shooter a heavy trigger pull of around five to eight pounds. This makes the trigger of the shotgun harder to pull, but that is the point because it is much safer and reliable to handle." from http://www.rem870.com/2013/08/13/10-steps-to-upgrade-your-remington-870-express-to-police-version-2/