Sion Q Indicator Bug

When used at the bottom of sloping terrain, Sion's Q will not indicate the area it strikes.

Bottom of the stairs: http://i.imgur.com/IComF76.jpg http://i.imgur.com/zj31vDr.jpg

Paths into River: http://i.imgur.com/uGSKGyA.jpg http://i.imgur.com/xFJkNX8.jpg http://i.imgur.com/FliJQea.jpg