Sidebar: I later informed CJ that he's half yankee, anyway, on my side. :)
So words were had, threats issued (for context, each child must wear a photo ID lanyard; CJ, having made the honor roll, has a "gold card" stuck in his ID sleeve which entitles him to things like early dismissal to lunch and recess), and when all was said and done, Grant ended up suspended from the bus and from school for two days.
Upon Grant's return, CJ received a letter of apology:
Click to embiggen (flickr)