Board Thread:General Discussion/@comment-6739926-20150118083555/@comment-26211408-20150318031725

I think of it more like water and dye. The magic is the dye and the water is a tool. If you use magic through a tool, then the tool is in a way becoming one with the magic. In a similar sense, if you use water to spread your dye, the water takes up some of the properties of the dye. So by them throwing magic across the mirror, the mirror itself is having that magical property, see?