[@Lucidnonsense] It's cool, don't worry. No floating rocks, unless they've been specifically enchanted to do so. As for your question... I'm tempted to say "no". Below a certain threshold, I'd imagine that the flow of magic through a person would get steadily weaker without almost constant practice, until it simply dried up entirely. Chances are, said drying up would occur before one was a toddler, since whether or not one can use magic is something determined at birth, and after that, they're just as powerless as the majority of people. So, no super-minor mages - if you're a minor mage, you probably have at least enough power to kill a person as though you had a gun on you.