The bullet from a 9-mm handgun struck a man in the leg, MLive reported. The bullet exited and then struck his other leg. Police said he was hospitalized and the injuries weren't fatal.
The instructor wasn't arrested, but the investigation likely will be presented to the Wayne County Prosecutor's Office for possible charges, MLive reported.
"I'm expecting some sort of negligent discharge of a weapon or something," Nenciarini said.