From Game Editor
Collision Finish is an event triggered by the event actor and a designated actor are no longer in collision. This is not to say when the collision ceases. Both actors involved in the collision must still exists for the event to be triggered. DestroyActor will not trigger this event.
Actor
This is the only setting for the Collision Finish event trigger. The options are for an existing actor within the editor, or Any Actor. This event is pretty self explanatory. It is used for self built collision methods, and one of the more common ways of jumping. By using the end of a collision with the ground or any actor, it is a good way of reseting variables.