we of course don't know more details about their conditions, and excuse me, jim and erica, we don't know more about their condition but that gives you a sense this happened on friday. there's still some people today in critical condition. >> and some of them just very young people. rosa flores, good to have you there, thank you. >>> joining us now the founder of crowd management strategies, paul wortheimer, for more than 30 years. paul, it's good to have you on this morning given your background here. i wonder, looking at this concert, based on what you know now, have you been able to identify security failures in advance that had they been followed might have been able to prevent something like this? >> crowd safety expert like me and others have seen this situation historically over decades, causing many deaths to young people in the front of the stage. one of the most dangerous areas for standing room. so you look at it, and you say first of all, the crowds are too dense, and you ask the question, who is monitoring the crowd, and who is managing the crowd. and in this case, from what