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Like running inside a box car in a moving train. You run 10mph relative to the box car, but relative to the ground you're doing You+Train.

Now assume that the train is travelling at the speed of light.

...through a dark tunnel...and then it turns on its headlights! Can you see anything?
What if you point a flashlight backwards down the path you've taken at lightspeed- are those photons 'moving' at zero velocity?