the whining chain blades triggered my duellist’s reflexes and I parried the blow with my own gently-humming chainsword without a second’s hesitation.
...
Not that I had any serious hope of besting him in a prolonged fight, of course; my unaugmented muscles would tire quickly, even without the strength-sapping cold, and his already superhuman endurance would be boosted by the power armour he wore. But if I could keep him pinned long enough for the troopers with me to line up a good shot and somehow disengage before they took it...
...
slashing down again with his cumbersome weapon. This time I deflected it so that it struck his own leg, raising another shower of golden sparks.

Traitor's Hand pg. 241