seeing as there is only one range and one danger area you may have been badly advised. The only other possibility is that they were using blank rounds in another part of the area.
If the red flag is flying I wouldn’t go in, if you get slotted you don’t have much recourse, i also wouldn’t assume that the bullets stop at the red flag, the danger area is based on a statistical analysis that takes into account the assumed angle of shot (at the target) and ricochets. The assumptions don’t take into account the ability of the firer to shoot straight, stray/ accidental shots etc anyone who has seen tracer will tell you bullets can go out of a danger area
“crack and thump” will also tell you that you are in the wrong place