Fiddlesticks Drain bug/stun.

When fiddlesticks gets stunned while draining. It still shows the animation of him leeching. He stands still with his arms out. This is confusing because how do you understand if you did get stunned, usually ill do nothing for a second or 2 after, since it "looks" like i'm still Draining. Some champs freeze up fiddle sticks drain and some don't. If he is stunned on the spot, then he tends to freeze up.