Jane knocked down the man who may have been more powerful than Jane, physically, and she got rid of the man. She acted out in self-defense and while acting out she showed more power than she is expected to show. There are several factors that are associated with the stress response. The response may be fight or flight. Fight was the option chosen and it was an automatic response. At the time of response she was under stress and the stress hormones were releasing, cortisol, adrenaline etc. Cortisol helps to stop all other major systems in body that consume a lot of energy to function.