How to detect when you end channeling?

[shinami]

Like the above states. How to detect when a unit end channeling? By moving or something like that? What i want is a channeling ability that would create a mirror image near you every 0.5 sec and for each image it would cost 100 mana. So the only thing i don't know how to do is to check when he ends channeling, well i might be blind because as far as i remember, i didn't see any "unit end's channeling an ability".

 

[Faust]

Unit finishes casting an ability.

 

[neckface]

Unit stops casting an ability

Ability being cast = ......

 

[Accname]

Unit finishes casting an ability.

finishing would only work if he is casting the channel ability until it ends by its own.
A unit stops casting an ability is what you are looking for. (as neckface already posted above)