Deputies were called to the bar on a report of shots fired.
Eric Blackmon, of Cincinnati, said he was employed by the bar as a security guard and was involved in an altercation with the other man in the parking lot. Blackmon said the man pulled out a gun and fired shots at him, according to the report.
Blackmon, who has a CCW permit, drew his firearm and fired several shots at the man. The man fled in what witnesses described a dark vehicle with the back window shot out.
Deputies found the man, identified as 30-year-old Joey Blake Brown of Westford Road in Trotwood. He suffered a gunshot wound and remains in an area hospital, Sgt. Kim Peters said.
Blackmon suffered a minor hand injury, deputies said.
The incident remains under investigation and no charges have been filed Monday.