we're joined by best selling author sebastian younger. his latest work is a documentary called "which way is the front line from here?" the life and times of timothy heatherington. one of the things i've found rather chilling, we saw in boston, it was iraq and afghanistan veterans who, you know, were there to help with the injuries and knew how to treat some of these injuries. similar to the guys that you were with when you were in afghanistan. tell us about those guys. >> well, i think all soldiers are trained in front line combat medicine. and those kinds of injuries, the main priority is stopping the loss of blood. my friend tim was killed not by ied but by a mortar in libya two years ago. he died of blood loss. similar kind of injuries, amputations, that kind of thing. very similar. >> you and tim were committed to presenting such an authentic picture of soldiers on the front lines. we've learned in the aftermath of monday's bombings that, you