I have a friend who works in the ambulance service. He tells me stories. I ask him to. The expected tragedies aside (horrific traffic accidents, families in peril, octogenarians dying alone completely neglected), the most fascinating details of his job, at least to my eager ears, are sourced from his on-job training days.  This is when he was instructed to shadow the movements of a 40-year veteran (now retired), learning his techniques, picking up his intuition. What most struck me and, it seemed, my friend, is how this guy was able to stride into a stranger’s house and, within seconds,…