on tonight but we have to begin with shocking breaking news. what appears to be a very very serious injury. tonight, monday night football game. between the buffalo bills, the cincinnati bengals. the bills safety, lamar hamlin, collapsed on the field after making a tackle in the first quarter of the game. this is where joe is so good. but now another bills players down. of the we can tell exactly who that is. maybe hamlin? good jordan player was able to go it was indeed hamlin. he was number three on the bills. we are watching it, he appeared to stand up for a moment before collapsing. it is incredibly disturbing to watch what is happened. we don t yet have all the information on his current condition. but we do know that in absence was brought on to the field and according to the espn broadcast, and then received cpr. on the field before being driven out of the stadium in that ambulance. bob costas joins us now on the phone. bob, so scary to see that. to watch consecutiv
and if the hearts is struck, basically, at the wrong millisecond. in the usual cycle of these electrical impulses. it can cause a catastrophic arrhythmia called a trivial formulation. and that would take about six seconds to figure out. and when you look at the tape, mr. hamlin made the tackle. got hit in the chest. got it right over the heart. that was the blow. he got a 0.2 seconds later, and wanted to second federica laps. that s along a takes few to pass out after your heart formulates. but what does that mean? i m pack that term for us. ventricular fibrillation. what does that mean? the heartbeats in a coordinated fashion the heart fibrillator s when the ventricle, the big thick pumping chamber of the heart regulates. and instead of squeezing rick