Isn't it true, too. that the effective weight in a suspension (the pull on the impact point - the hooks or pins, or the handcuffs) will increase several times if the person suspended is moving, wriggling, struggling? Of course in movie depictions of the Sun rite and the like they don't struggle, but I'm very sure me or Muse would if we were suspended by hooks into our breasts/nipples and with no sedation.