what happened next, has forever changed stephanie fischer's life. >> when i first walked up i said fight through it, sean. he was fighting. like, trooper is seriously a under statement because he was fighting for his life. >> reporter: registered nurse stephanie fischer was trying to save officer cullen. she has been a nurse for two years but instantly she saw how gravely he was hurt. she did everything that she could do to help. >> i wanted to get him home to his family. as we were working on him, one of the troopers yelled out that he just had a baby, and another on his way. i think that all pushed us to work even harder. >> reporter: moments later a helicopter rushed cullen away. fischer and her state trooper boyfriend went home. it was only later she learned cullen a had died and she made a post on her face book page. >> i walk in the house at 1:00 , covered in blood. i said to myself, this is what i was going to do, help save lives. please god protect these troopers, and all enforcement as they protect us. rest in peace trooper cullen. >> truly. >> reporter: fischer's brother-in-law

stephanie: one of many. what else? already talked about negative interest rates. what is so magic about $7 trillion? not $20 trillion? you had stanley fischer saying, i'm actually surprised that negative interest rates are working. if you are in a deflationary environment, why not set your inflation target at higher than what is historically -- what it historically has been? what is so magic about 2% in japan? why not 3%? there are any number of tools you can use. david w.: there are unintended consequences from these actions. we are very dependent on money markets in this country for funding, much more than other economies. how would that work with negative interest rates with money markets? tom h.: in negative interest rates, what are you doing? you are looking at a diversifying asset. what is cash? it is a diversifying asset. you don't earn any money. at some point, you could argue that there is a limit to what you can have in terms of negative interest rates. 1% or -2%, but we are far from taking a from that level. do we write the rules? you assume risk, you are paid to assume risk. you will not get paid if you hold to maturity this tim