jhin W root shot bug?

ssssooooo getting my butt handed to me in top lane as singed against a jhin. and undertower i flip him as he's casting his W and instead of interrupting it it continues to fire with the display line and everything and rooted me >.> . thats the only real bug i have to make note of but just an opnion i think the time on his root chance is a bit too long.