There are moments when, even with the ability to rewind time, I hesitate to use it.

If I made a serious mistake, of course, it would make sense to use my ability. If I could prevent someone from getting hurt or save someone who should have died, it would be a win for everyone.

I could also use it to make myself perfect. Rewinding time to study for exams and get excellent scores, or to ensure that I never miss a shot when firing a gun—these things could be done easily.

And I’ve done that. On the battlefield, I took …