the body is so fragmented, it's very difficult to tell. >> good point indeed. dr. mannion, thanks very much. david soucie thanks to you as well. >> my pleasure. just ahead, the full story behind the most incredible, most terrifying video we've seen in a long, long time, a firefighter is swallowed up by flames, and survives. details next. i'm brian vickers, nascar® driver. i'm kevin nealon comedian. and i'm arnold palmer, professional golfer. know what we have in common? we talked to our doctors about treatment with xarelto®. me, when i had a blood clot in my leg that could have traveled to my lungs. that's why i took xarelto®, too. xarelto® is proven to treat and help reduce the risk of dvt and pe blood clots. i took xarelto® for afib... an irregular heartbeat that can lead to a stroke from a blood clot. xarelto® is proven to reduce the risk of stroke in people with afib, not caused by a heart valve problem. hey, well i'm glad we got together. for people with afib currently well managed on warfarin there is limited information on