The way they are behaving seems absolutely guaranteed to generate the reaction that has been generated.

Unless the pinch was offered purely symbolically, along with a punch, for the first of the month, the point of it, presumably, was to generate a reaction from an opponent.

Wind turbines use an airfoil to generate a reaction lift from the moving fluid and impart it to the rotor.

As with deformation of a spring, deformation of the tire contact patch generates a reaction force in the tire; the cornering force.

Each of these environmental objects, in turn, generates a reaction force directed forward and towards the midline of the snake, resulting in forward thrust while the lateral components cancel out.