I was out at the local range test firing some guns. On another range, I observed an IDPA competition going on. One course of fire had the shooter: Start in a box with firearm loaded, on beep, Engage 3 targets while walking from a box to a podium, Change magazines at podium, Engage 3 targets while walking backwards from the targets with cease fire when shooter got to second box. In my years as IPSC and USPSA course designer, one rule was never to set up a course of fire where the shooter is walking backwards. The reasoning was that the shooter could trip and have a possible ND. I understand the IDPA rules of "making the course of fire as realistic as possible within reason", but would walking backwards while engaging targets not be a safety consideration?