Carter is having is run along with paramedics and the call comes dangerous when some people get mad about them and attack them. Carter tries to get away and runs over a boy. Later when the return to the same spot without Carter the paramedics get shot - Carter already felt guilty about the accident and now this. He tries everything to save him but when he is send to OR he is asked to stay down and just follow - but they lose him.
Also we have some focus on Carol who is not feeling well - she is missing Doug and not feeling well. That leads into great discovery.