It would be horrible to be in those towers when you know you're going to die. But I think it would be worse to be the families that receive the news that their family and friends won't be coming home. Because if you were to die on those towers your life would be over and you won't have to suffer the pains of life anymore, but the families have to face that you are gone and still have to suffer. 
Now let's say I was in the second tower before while the first one was hit. I'd like to know what I would have done. Would I've ran out of the tower as fast as I could and try to drag some other people with me or would I`ve thought, "It`s not me, I'm probably saffer here.". I think I would have took option number one, because I am always too careful for my own good. But there is only one way to know for sure, if you were put in a situation like that. For example I would like to say I would always stand up for my family, friends, and beleifs. Would I die for them? I want to say yes, no doubt about them. I want to know that I am good and strong. But I have to be in a situation that would challenge that, to know for sure. I would rather die falling of a very tall building than burn to death. In other words I would rather die quickly than die suffering. Sometimes people don't understand that. They don't understand that, maybe one of their loved ones would rather die right away than fighting to stay alive. We want are loved ones to live and it is somewhat selfish of us. Who knows what is waiting at the end of the tunnel that leads to death.
One thing I found that was very impacfull was the music. I almost wanted scream"Shut the music off!". I didn't want to cry. Not because I didn't want to cry in front of my friends, I just don't like being sad. What made it even more unbearable to watch was the people screaming and crying. It was soundless but I couldn't bear to see the sadness of others. Sadness is maybe even worst seeing than anger or violence. One day I hope people will learn from their mistakes and we can have a peaceful world again, without stopping natures course, of course. :)))
