I've already warned about rope across the throat, or in a way that could obstruct circulation or breathing, so where else is bad news? Bindings should ideally not be placed on joints, except on hips, due to the risk of the loss of circulation or nerve damage. Try to place arm or leg bindings above the bony area of the joint. Another good rules is, if you aren't prepared to swing by it, don't tie it - in other words, don't tie any part of the body, or a piercing, to a fixed or heavy object that could be pulled off or otherwise damaged in the event of falling or fainting.