WW Q animation on point?

HI I'm playing WW a lot and found a bug?! It just happend under my Tower. If I click fast Q on the creep, which is focus by the tower, I heard his eating sound, but it deals no dmg and I lose mana -> creep dies to tower. press Q -> Q sound -> Tower hit -> creep dead -> Q animation end (lose mana and skill run into CD) -> no gold In my opinion, if WW Q something the damage should come simultaneously with his eat sound and not with few milliseconds delay. Is this a bug?
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