"According to the investigation, Darryl A. Saddler, 62, approached the victim in the Hollywood Casino parking garage and displayed a firearm," police said.
"The Escalade made a left turn, and an 18-year-old woman who was dancing on the roof fell off and onto the pavement," a Sunday morning statement from police said.
The driver, a 52-year-old resident of Columbia, was critically injured, but police said he's expected to survive. Two suspects were taken into custody.