and after that flash of the dead , suddenly the crowd is the crowd again , and it 's not the six thousand people who died , but six thousand other people , randomly joined by an affinity for this britpop band , and i understand the energy i felt before but did n't have a name for-it 's the energy of gathering , and the reason it 's so striking is that none of us have gathered like this since 9/11 , none of us have been a part of a crowd , none of us have acted out in unison in this way .