Published: Nov 28, 2013 12:23 AM EST

LEE COUNTY, Fla. - We're getting our first look at an attack on a 72-year-old man in South Fort Myers. Deputies say the attack happened Monday and it was all caught on a cell phone camera. Out of nowhere, you see someone run up and kick Robert Lerberg to the ground.

"I have that image of her standing there laughing in my head and nothing will erase it," Lerberg said.

This disturbing video shows a group of teens watching Lerberg pulls weeds at his Memoli Lane home. Seconds later, one of them runs up and violently kicks him to the ground. The video shows Lerberg falling hard on his left hip while the group laughs and runs off.

"I don't have the words," Lerberg said as we watched the video. "I don't think they are in the English language to express what I think of that. She kicked me hard. I knew she had kicked me hard, but now I see it and I went down hard. The only words I spoke were, 'very funny. Thanks a lot.'"

Investigators say a 15-year-old girl is responsible. She is now charged with two counts of felony battery. We stopped by the suspect's home several times but no one answered.

WINK News is learning that she allegedly struck twice that day knocking on 89-year-old Harry Hurwitz's door on South Pointe Boulevard. "As I opened up, the girl who stood next to the door slammed me," Hurwitz said. "Of course, she couldn't get a good grip so she just sort of hit the side of my face and off they went."

Hurwitz remembers seeing around five people outside, one of them pointing a cell phone toward his door. "This is terrible," Hurwitz said. "I would never think it would happen in Fort Myers. This is not New York."

Lee County Sheriff Mike Scott said the young girls are imitating a viral video trend called "smack cam" where someone sneaks behind another person and smacks them. "It's certainly not funny for the injuries that can occur, for the charges that will result, for the trip to jail," Scott said. "There's nothing funny at all about it"

Aside from being a bit shaken up, both victims are doing fine But, they hope this violent trend ends before anyone in Southwest Florida is seriously hurt. "I don't know where it comes from in their brains," Lerberg said.

"These young ladies have to learn to become young ladies, to learn what it means to be socially responsible," Hurwitz said.