Shot on April 23, 2017, the clip shows a makeshift target with the words "Boy" and "Girl" on it, set in the middle of the desert near Green Valley, Arizona, south of Tucson.
Seconds later, we hear a shot and the target explodes, revealing a blue cloud and immediately igniting the surrounding brush. Someone yells: "Start packing!"
The 37-year-old dad had charged the target with a highly explosive substance called tannerite and fired it with a high-powered rifle, according to the US Attorney's Office. The target was supposed to explode in pink or blue to reveal to the participants if Dickey and his wife were waiting for a boy or a girl.
CNN contacted Dickey's lawyer, Sean Chapman, but did not get an answer.
As part of its advocacy agreement, Dickey will make a public service announcement with the Forest Service on the cause of the forest fire.
According to KGUN, the Dickeys did not specify whether the child was a boy or a girl. But the blue puffs during the target explosion could be a clue.