Bedhivere, you're being silly.

Assuming the difference between you and whats-his-face was about 100 meters, and you traversed that distance (and killed him) in a thousands of a millisecond, you would be moving at a speed of 100.000.000 m/s, which is over 1000x the speed of sound. You're reaching the speed where your velocity would create a sufficient increase in mass that it would force a gravitational flux, ripping apart half the base.

I know we're not going ultra-realistic, but I think for the sake of balance, as well as base logic, we should put a limit on characters who want to move at Mach 300.000, or anything similar. Darkness or no, that's just plain silly.