Throwing a baseball it's a projectile by mechanical means from arms.....
Well, technically that would be a firearm since the bat's being launched by the guns. In all seriousness, however, this is in the category of things that prove our elected overlords are not terribly well educated and seek to have subjects to rule over as opposed to citizens who may act as a check upon their authority. Unfortunate for the citizenry of Delaware, most believe the propaganda, and most are aligned with our overlords; they are happy to be subjects.