Flying at 1600 m.p.h. you act with split-second timing after you sight the enemy. And you're allowed only one mistake—your last! My radar picked him up when he was about five hundred miles to my north-northeast and about forty-five miles above me. I switched the velocity calculator on him as fast as I could reach it. The enemy ship was doing sixteen, possibly even sixteen and a half. I took the chance that it was most likely an Ivar Interceptor, at that speed, and punched out a temporary evasion