Sion bug spotted

I was playing Sion in a bot 5v5 match just to test builds. At 23min in the game me and the bot were having a team fight when I began to cast my Q to knock them up, I got snared by a Lux. As the snare wore off, my character moved half an inch or so and actually did an about face and cast the q directly behind him.

TLDR: I'm talking about Sion's long cast knockup, it was channeled one way and then cast the opposite. I think the snare had something to do with it.