[ That would make more sense, wouldn't it? It's a logical conclusion to make, but it only makes Yumeko warmheartedly giggle. ]

If you think of the explosions as feet on the pedals of a bike, each one pushes the pedal down, and the force rotates the axle that holds the wheels.

[ She uses her hands to demonstrate, holding them flat, palms down, and moves them up and down in alternating directions. ]

Clever, isn't it?