The executioners were slaughterers who did not know how to add normally, but yes, an English doctor if I remember correctly, did the calculations on weight, height and height of the fall so that he would break his neck. Half a meter more and they would lose their minds... on one occasion I looked for it but couldn't find it, probably due to my poor level of medical English. But well said, a good height and one thing or the other, it won't hurt. You may see your head spinning in the air for 2 seconds (that's what some scientists said about the guillotine) but what difference will it make? Objective achieved