BRENTWOOD, Md. -Fox 5 has obtained surveillance video of a February 3rd incident involving a Prince George's County police officer that seems to dispute his story about why his gun discharged.A Cottage City 19-year-old spent nearly 4 months in jail after Corporal Donald Taylor claimed Ryan Dorm assaulted him and the gun went off as Taylor struggled with him. The surveillance video is from a business on Perry Street near Rhode Island Avenue in the Brentwood area. Attorney Jimmy Bell, who represents Dorm, says the video shows Taylor out-and-out "lied" when he wrote up a report supporting assault charges against his client.The incident started when Dorm and a friend say they went to the "Lowest Price" gas station convenience store late that night to buy snacks. Dorm says his friend was wearing a ski mask because it was cold, but two police officers thought he looked suspicious and were going to rob the store. Ryan says he wanted to avoid any trouble, so he left.. But he says Taylor and a second officer followed him. The video shows Dorm being approached from behind, then smacked in the head with a gun. The video shows the flash from the gun as Dorm was being struck.Taylor has been indicted and faces a trial in November. Bell has filed a $10 million dollar civil lawsuit in the case.