>> they have special trains, hostile surveillance, radiological detection and they're trained with the equipment that goes along with that. >> when youer that isis has put out a new video even though it looks recycled of some of their greatest hits, what changes with the nypd? how seriously do you put stock in that? >> we looked the that video when it came out and we realized it was recycled operation. also the operating premise, we are, here in new york city in times square, we are the target. we are the terrorist target. so we factor that into the analysis every day. we informed new yorkers and briefed them as part of the program and then we deploy them. >> our city leaders have told new yorkers to go about their daily business, not to change anything. of course in theory, that is the right answer. but in practice, how did the new yorkers not feel nervous about going a music club or