Reckless endangerment comes to mind for charges. 
25 CFR § 11.401 - Recklessly endangering another person.
A person commits a misdemeanor if he or she recklessly engages in conduct which places or may place another person in danger of death or serious bodily injury. Recklessness and danger shall be presumed where a person
knowingly points a firearm at or in the direction of another person, whether or not the actor believed the firearm to be loaded.
No malicious intent was involved (they were target shooting which is legal) determined by the investigating Sheriff Sarg. (However, charges can be brought later)
At this point, I have two estimates' next week, I will present the cost to the Perps...
I HOPE it can be resolved with them paying damages.
worst case... Shooting Into an Occupied Dwelling
In Florida, if you shoot or throw a “deadly missile” into a building, vehicle or vessel with
wanton or malicious intent, you could be facing up to 15 years in prison and a fine of $10,000..
This is true even if absolutely no one was injured as a result of your actions.
Possible Defenses
There are a host of possible defenses in these cases. Prosecutors will sometimes try to use the severity of the charge to strong-arm defendants into pleading guilty to a lesser but still-serious offense. This is not a decision that should be taken lightly. Recognize that there could be an effective way to have the charges significantly reduced or dismissed altogether. Some possible defense strategies may include:
Vehicle was not occupied; N/A
Lack of sufficient evidence to identify the object; (We have the bullet)
Object was not one that could have produced great bodily harm or death; BULLET !
The shooting, projection or throwing was accidental;
There was no wanton or malicious intention;Not enough evidence defendant was the one to throw, shoot or project the object. They admit and were in the act of shooting when the Sheriff arrived and saw them !