The actions I said aren't actions.
Like I said in my post it's only possible to reverse the sucking if you know how the sucking is done.
The void isn't attracting the objects towards it, the objects are set to move toward the void.
If you reverse this action you won't even see the objects anymore.
You should make an event in which if the objects are near the void it starts attracting them.
I see you haven't used any variables or extra conditions in any of your events. Have you followed enough tutorials to know how to make events?