I am aware that an observer in free fall in a gravitational well will measure the local speed of light as c, but what about someone outside the well. Imagine this, Me and my friend are near Earth, and he starts freefalling to the surface, while i stay in space. If he then fires a laser beam at me, will I measure the laser travelling at c? And if I fire a laser at him, will he measure the laser travelling at c as well? Now imagine we are in space (no gravity) and we are moving at a constant velocity. Now imagine that I turn on a rocket engine and accelerate away from him, when he fires a laser at me, do I measure it as c, and if I fire at him, does he? Thank you for your help, Ivan.