A person is guilty of a class A misdemeanor, except if the victim is under the age of twelve years in which case the offense is a class C felony, if that person:
1. Willfully causes substantial bodily injury to another human being; or 2. Negligently causes substantial bodily injury to another human being by means of a firearm, destructive device, or other weapon, the use of which against a human being is likely to cause death or serious bodily injury.