User blog comment:Miskos3/Fairy Tail 526: My Name Is..., Review/@comment-107.77.87.123-20170313165108/@comment-75.167.207.157-20170313174319

I think what the chapter was implying is that August needs to see how the magic is created. Since holder type magic already has the magic formed and inserted into it he can't copy it. Think of it like software. If all you see is the GUI you can't copy the program, you need to see the code.