. >> stand over there, we're making arrests right in front of that vanover there.the police dog is out. stand right here. if you see a german shepherd come up this street, jump in this car. >> just in, school over real fast. >> i can't believe this. >> her mom is watching her daughter kaitlyn in a nearby van and she is stunned than in less than a minute, her 14-year-old daughter has just climbed into this stranger's car. >> i can't believe it. >> kaitlyn, actually, this is not really a police incident and your mom is right up here in this van. this is for abc news. >> that's not funny. >> no it's not. >> try to be as honest as you can. what did you really think? >> i didn't think you were a cop. >> that's good. why did you go with me? >> i don't know. >> reporter: what is it that makes this teen do everything she was taught not to do. >> if you don't know what to do, you're going to do what i tell you to do. i had you all the way in the car. >> reporter: police believe ariel castro lured all three of his victims into the car. next, bob plays a would-be kidnapper se