The joint on final travel is very weak so mechanical advantage of above the average person is useless .The pain tolerance maybe it's higher because of this ability but if you twist the trapped arm or feet the pain will come . Because immobilisation came before applying the pain techniques this double joint feature is no guarantee to escape but will probably have some degrees of freedom and more time to think to tapp. https://www.instagram.com/p/CFzfLJ9jeGv/?utm_source=ig_web_copy_link