RE: Did i just kill my servo??????
When you grasp the output arm of the servo you have a great mechanical advantage on the motor. When you move the output arm the motor must turn over many hundred times for every degree you move the output arm. In a servo with the three pole motor like the 5645 the motor resists turning over and if you persist you will most likely break one of the gears. With a servo with a coreless motor you will probably get away with it unless the motor has a load on it.
If you want to test a servo hang the rated load on the output arm-gently.Then move the control and see if it moves it.