Suddenly the head-warden feels an unbearable aftershock of pain in her groin. Her body violently reacts to the debilitating pain. Her knees buckle and she crumples to the floor. At this point the prisoner's decision to groin-strike becomes clear. The strike wasn't just meant to cause intense pain...it was intended to injure and put the head-warden out of commission. This is the exact reaction the prisoner was looking for.