One approach is store a reference to the "currentAnimation". Whenever a button is pressed, reverse the currenAnimation and apply an onReverseComplete that will call a function that will then play the next animation. As Jack mentioned, it really stinks to be forced to wait for an AI to allow you to do something. It also stinks watching transitions that are too long. To alleviate that pain, I increase the timeScale of the currentAnimation that is being reversed:   See
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