combat tactics, 
reality skimming

Reality skimming fighters cannot hurl anything (including light) at each other when travelling faster than the speed of light. Instead, hostilities play out around one of the following strategies:

• wake-lock grip wrestle Match velocity and mix with your opponent, then once you have control, drive them harder than they can stand. A handy tactic for superior pilots with grip and stamina to burn. Not advised if taking on a more rel opponent.
• drive opponent into "bad weather" Only known space lanes are certain to be hard vacuum. Even gas molecules or dust particules can become "bloodied space" if particle density gets too great to be dispersed by intrusion field. Driving an opponent into a direct collision with some unimportant hunk of space junk is also completely honorable. Major and serious bad karma with the Watching Dead if you trash life-supporting habitat that way, though. Bad weather can also include areas where spacetime integrity has been weakened by reality skimming shake-ups.
• wake-dunk the enemy A "dunk" is an unexpected and unwanted dose of gap. Messing up the space around your enemy by swooping close is a good way to do this. If space was water, it would be something like the motor boat overturning a canoe with its wake. Getting a couple of ships to criss-cross in front of an enemy can do ti too. Pilots can do this to space stations, as well, to scare them. Might just crack them or wipe them out, though, so it is a tactic employed only by atheists or those willing to risk their souls on the righteousness of their cause.
• hull cracking Hullsteel vessels won't crack, exactly, they shatter. Their structural integrity is very high. But if it is exceeded, across the board, then everything goes at once. Dust fields of hullsteel are particularly nasty debris for making "bad weather", although hunks of cracked space stations make a mess as well.
  

Rel-fighters are spherical, 1-person crafts. They can maneuver in any direction due to internal, gyroscopic sling cockpit.