[Shelpies]

When hit by Illusion Flurry during Shadow Walk and Illusion Flurry wears off BEFORE Shadow Walk wears off, your Shadow Walk breaks and you can now cast spells during Shadow Walk itself.
Additionally this presents a relatively harmless and funny graphical issue where using the broken Shadow Walk and Lightspeed (or something that briefly tampers with the filter) as your Shadow Walk wears off turns your icon semi-permanently into a black shadow.

Getting hit by Illusion Flurry again while Shadow Walk is broken fixes it.