a specific and credible threat. now some say if everyone in the building had been able to carry arms, guns, the number of victims would have dropped dramatically. so let's talk about that. tom fuentes is a former fbi assistant director and cnn law enforcement analyst, also part of the fbi investigation into the 2008 mumbai hotel terrorist atta attack. good morning, tom. >> morning, carol. >> so let's go back to the story that evan perez just told all of our viewers, about what happened inside that building. police were running down halls, and there was this horrific gun battle going on. >> right. >> your thoughts on that. >> well, first of all, from a tact kell perspective -- i was a s.w.a.t. team member and s.w.a.t. team leader -- the lasting thing you want to be in is a situation where the bad guy has the high ground. in this case, when he's on the fourth floor, as police officers are arriving, he's looking down on them. that makes it a much more