Cho'Gath Flash Rupture Bug

This has been a problem for as long as I can remember on Cho'gath that I eventually learned to play around. When you flash Rupture (Q) with cho'gath to catch someone who is running, his rupture will go off of the range limitations of before the flash rather than his new position after flash. This forces the only option to be for you to flash, walk a little, and then rupture which rarely will hit due to the obvious nature of rupture.

Would love to know if anyone else has experienced this.