We just were not paying attention. First step - acceleration. Second step - reflex reaction to acceleration feedback. First step, velocity crosses a stimulus threshold. Think of it as fireworks.
Stimulus goes up and an umbrella of activity comes down.
It has become a muscle transfer strategy to get certain key muscles to velocities below recruitment level, that is rates that do not reflexly activate other muscles at a distance. Minimal scar has functional advantages. It is also much easier to revisit, if need be, at a later time. It will not cross link fast and slow muscles. Muscle tension and range are evaluated as the surgical process is underway.