One teenager lost his foot and another faces charges after an accident on Lake Lanier on Saturday, officials said.

Shane Malloy, 19, fell off a boat and into the water. The boat, driven by 19-year-old William Craven, ran over Malloy’s legs, severing his right foot and severely cutting his left foot, Hall County Sheriff’s Office spokeswoman Nicole Bailes said.

The cause of the accident is unknown.

Deputies found the teens about 4:30 p.m. at the Bolding Mill Park campground and immediately suspected alcohol played a part in the accident, Bailes said.

They called Department of Natural Resources rangers, who arrested Craven on charges of boating under the influence of alcohol, reckless operation of a vessel, operation of insufficient personal flotation device and littering. Craven was booked into the Hall County Jail. He was released on $8,300 bond.

Malloy was flown to Grady Memorial Hospital in Atlanta.

The DNR impounded the boat and plans to conduct a full investigation, Bailes said.

Craven’s attorney told Channel 2 Action News his client was not drinking any alcohol and is traumatized by what happened. The attorney also said his client’s quick thinking prevented an even worse tragedy.