I saw a documentary on time travel and one section got me thinking.  Imagine a photon bouncing back and forth between 2 mirrors.  If you move the mirrors sideways the photon will keep following the same path relative to the mirrors, i.e it will move sideways with the mirrors.  
Am I right in thinking that a laser does not bend with movement?  If you move a laser around does it "drag" like the water out of a hose or will it keep a straight line?
My thinking is that if it does keep a straight line then what happens if you spin a powerful laser at high RPM?  Like a spinning arm the outer section moves faster than the inner section.  With an arm of photons stretching out hundreds or thousands of miles and spinning hundreds of times a minute there has to be a point where the photons move sideways faster than they move outwards.