Chanelling with Triggers

[Aoen]

Lol I know I've been posting a lot but I want to get all of my questions answered . Nyways, for my chanelling ability made out of tranquility I have a trigger that detects when the chanelling is either interupted or it ends. Would you use the "a unit finnishes casting an ability" for the event for that trigger or "a unit stops casting an ability". (The event doesnt have to detect if the ability ends, but it can if there's a problem)

 

[PurplePoot]

Finishes means that they completely execute the ability, while Stops means that it stops in any way, whether completely executed or just interrupted. [far as i know]