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That goes out? i know in ieds, the shrapnel causes a lot of pain, but it's the shock wave of the force that can liquefy, pulpify organs. >> yeah, it's tough to think about, but simply from a rifle energy, simple math, it's the speed of the bullet that makes all the different, even more so than the size of the bullet. it's the velocity. and the velocity of a bullet moving that fast can cause a blast wave that start to cause tissue energy even before the bullet gets there. and it can also cause this blast or calvation remotely from where the bullet is. everyone focuses on the trajectory of the b...

Shrapnel may have been used in this bomb which would mean nails. what types of injuries do we usually see from situations like this? >> you know, don, we used to say these were the types of injuries you'd only see on battlefields but i think over the last few years now, that has changed. these are becoming civilian injuries that civilian hospitals have become too familiar with treating. what typically happens, you know, is that you have sort of three waves, if you will, don, of injury. a primary wave which is the blast wave, itself. it's basically the concussive blast wave that causes the firs...

In other words, blocks without a ticket where you would not be able to gain access in this area? and then this person could have obtained a ticket, so then that is not even 100% a measure of keeping terrorists out. is there anything that could have been done to prevent this, you believe? >> you would like to think you can prevent everything that is going to maybe be planned or executed and in a free society, you cannot do that. however, that being said, we were actually fortunate in two ways. the cohort of mind in the u.k. contacted me this morning and it said one of the things that may have l...

In a remote, mountainous area of eastern afghanistan that borders pakistan. kourtney was live with us yesterday when the news of this came out. good to see you again. this bomb has been in the u.s. arsenal for decades. why use it now? >> well, as you mentioned, it has been in the arsenal for decades, but what was the target that made the military pull it out now? well, general nicholson, the commander there, talked about that this morning and mentioned it was a large isis complex with an intricate tunnel system underneath. so the gbo-43, the mother of all bombs, as you said, it's actually a pr...

Fighters killed in this strike came from the afghans. the u.s. military is not confirming that. they're still saying they know there was a large contingent of isis fighters hit, but they don't have any specificity on numbers. the bomb itself was a 21,000 pound gbu-43. yesterday when we first heard about this, everyone was asking this question, why did they need to use such an enormous bomb? the answer is the target itself. it was a complex, an isis complex with a relatively extensive tunnel system underneath. this gbu-43 is not only an enormous payload, but it's a blast munition. so it hits th...