Fiora can't stun Rumble's E [GAMEPLAY

In the title, briefly describe the bug and tag it as either [GAMEPLAY], [CLIENT], or [CRASH] In the body of the post, include a more in-depth description of the bug you are encountering. Follow up the description of the bug with numbered step-by-step instructions on how to reproduce the issue. Include how frequently you can get the issue to occur and any video or screenshots of the bug that might help clarify it.