Board Thread:Wiki discussion/@comment-4881935-20130327060139/@comment-6301771-20130408035514

KarasuGamma wrote: Disregarding your astounding display of self-control in the first half of that post, my point about Crystallize was, from a pure gameplay perspective, that Crystallize and Glacial Storm are Anivia's primary zoning mechanics - drop Glacial Storm down a hallway (be it lane, river, or jungle), and then set up Crystallize to seal it off from the side, trapping enemies inside the storm. You're right, I would never place it through the center, because that defeats the purpose of using both abilities. I can't even see where you would've gotten that from, or how you could ever think of something like that and give it a strategic use. And yes, it depends on both the width of the area and the size of Glacial Storm, as well as the current length of Crystallize. In the jungle, Glacial Storm spans the entire width of the hallway and then some; in mid lane, it doesn't. Knowing the width of the lane and directly comparing that to the diameter of Glacial Storm specifically helps planning its use in lane - is it worth putting down Storm followed by Crystallize at the back, to keep a constant source of damage and slow during teamfights, or should I wait, lead them through the jungle, and shut their escape down? For a situation like this, I still don't see any reason radius is more useful. Finally, an actual use for diameter. Yes, knowing the width of a lane or the jungle and comparing that to diameter is indeed useful.

So double the radius. Ta dah.