Actually. Those were the throttles. He was moving the back and forth so much because he was catching air and the props were coming out of the water. If left in gear he would/could have spun a prop. He was in a race/speed boat(look how the seats were designed to be leaned against. Tabs are controlled by buttons. If you have any more questions let me know. We do have a race boat.
Pic is an example. Props out, throw her in neutral!
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