I'm trying to identify a science fiction novel I remember reading as a young kid from my school's library. I only remember two things about it (apart from having a generally positive impression of it):
- The cover seemed to have a photo of a man with a metalic/robotic arm;
- Combat between people took place by entering a fugue state and jumping back in time 5 seconds and behind your opponent. When two people had this ability it lead to a stalemate of them jumping back and back till an observer got fed up with it.
It would have to have been published before 1985ish. Any thoughts?