Damage and Stun from Aurelion's Q do not happen at the same time

See title.

There's like one or two ticks between. It's kinda frustrating versus mobile targets. And this isn't just the usual stuff goes off even while CC'd bug, because even targets without mobility still move a few steps after taking damage - it's just not an issue to work around a few steps.

There's also some sort of internal cooldown on reactivating the ability that is not displayed in the tooltip nor reflected in the icon - but double tapping it doesn't work like 99% of the time. Q_Q Or maybe it's a global cooldown, 'cause W refused to turn off sometimes.