Ambivalence is truly the source of much suffering in this life. It is derived from the nature of duality in life. The neuron has only one of two choices to fire or not to fire, and so our perception of reality is that there is duality in everything. The figure here cannot choose if he wants to let go with his hands or his feet first and so he suffers. Make a choice and stick with it. It is the path to happiness because no matter what you do doubt will always be there.