Man o man, now we are talking warp speed (but even at this speed light will still travel at 186,000 miles per second away from you. It is relative after all.)
Seems we have a resident expert on that kind of speed. He may know a thing or two about gravitational lensing as well. Great way to "see" around objects!
The problem with deer is that they are unpredictable. The best a rider can do is manage the risk: reduce riding time at night and even daytime in areas with high deer populations, especially during rut.