waiting to come out of this thing and they just heard this explosion and they re watching all these people running down the stairs in your heart just stopped thinking about what it s like to these parents as they are probably arriving to pick up their children at this concert because it was just ending. tony s going to listen with us to this explosion on the video one more time which each is described as something sounding like an ied. let s listen to it. all of us together. no. martha: the response from the person in the cars dashcam video. that s a large explosive sound to be sure. my experiences i ve been within proximity of ied is going off in afghanistan and this kind of what they sound like. it s a very sharp concussion and then nothing. so i think from what i ve seen