I thought the hijackers in the second plane were surprised that the first hit was still up (though I’m not sure how anybody would know that). It would be a tough act to follow (they they have nothing but time to work on it).
Quite a few years ago there was a tape of Bin Laden talking about 9/11. He said that they never dreamed the Towers would collapse. It was posted on FR and there was a poster who spoke arabic. He vouched for the governments translation.