The department said it was called to an apartment complex on Kuykendahl near FM 1960 around 8:30 p.m. on Monday after getting reports of a shooting.
When they got there, deputies said they learned that a couple of hours earlier, around 6:30 p.m., there was a fight between teenagers that a mom eventually broke up.
Investigators said a different mom went back to the scene to clarify what happened, and that's when the shooting happened.
"During that incident, an unknown adult individual in his early 20s arrived on scene, causing a disturbance. The juvenile's mother, who was present, fearing for her son's safety, withdrew a firearm and shot several times in the direction of this individual, striking him once," HCSO Sgt. Freder Munoz explained.
In an update, Sheriff Ed Gonzalez said the man who was shot is 23 years old. He was taken to the hospital, where Gonzalez said he's in fair condition.
At the scene, deputies said it was possible the man was on drugs. HCSO later told ABC13 there is no confirmation of that.
The sheriff's office also said they haven't been able to determine if the mother, or anyone else, knew the man.
Several people were detained at the scene, HCSO said.
HCSO said it's still conducting interviews, and that there isn't enough evidence for any charges right now.