[Trigger] Decrease Cast Time with Trigger help!

[reatek]

So I'm trying to make an item and having it decreases a spell's casting time.
Example:
Chain lightning cast time 3 seconds and with item it becomes 1 second.

 

[overload119]

Event - Hero picks up item
Condition - Item is LightningBuffItem
Action - UnitRemoveAbility(oldLightningAbility)
UnitAddAbility(newLightningAbility)

Event - Unit drops item
Condition - Item is LightningBuffItem
UnitRemoveAbility(newLightningAbility)
UnitAddAbility(oldLightningAbility)

Assuming, the CASTING TIME is not triggered.