[GAMEPLAY] Bug on Syndra's Q-E stun

Was playing a ranked game as Syndra earlier when I launched an orb at a Katarina under tower. The orb very clearly went in a straight line through her body as she took the proper damage, however she was able to walk away with no indication that a stun of any length had affected her. Not completely sure how to recreate it as this was the only time I noticed it happening. Thanks for any help that can be provided!