Uh, "For when you absolutely, positively need to light up every witch in the radius of 2500 yards"... I guess?

Problem is, you gotta to hope that the witch's labyrinth has enough room to use it in it's full effect. But seeing how she has a shield of unlimited holding, this shouldn't be a problem, she can just put it back and take out a benelli with 12 gauge buckshot if space inside the labyrinth is a concern