1)Well, it wouldn't be spellcasting at all (At least not for now, maybe later in a more simple term of energy (Nothing crazy either)). He would simply be able to be physically stronger, faster and tougher than he looks, but not to the point of being godly. (Just a lot more powerful than people believe him to be.

2) Well, he could talk to the King and he KNEW the king wouldn't harm them... But if someone else comes along, this protection isn't valid anymore