Transcript for Chance Encounter With Filmmaker Changes 'Wolfpack' Brothers' Lives  Reporter: After 14 years of claustrophobia and confinement, mukunda Angulo has broken free of his father's rules, liberating his brothers who now follow. The youngest is 11, the oldest 18. While their father stays in his bedroom behind closed doors, his sons take their first steps outside their apartment without him. What were those first forays out like? Pure excitement. Reporter: Pure excitement? Yeah. Reporter: They are tentative at first, traveling in a pack, not going far from home base. Their senses are heightened. A simple stroll is supercharged. They revel in their new freedom. Having Independence feels really great if you have never had Independence your whole life. Reporter: Yeah. It's so powerful, you know? You feel like, "I can survive, I can. I have much more confidence, I can make it." Reporter: Even as they're breaking free, their lifeline remains the movies. This is like 3-d, man. Very fresh out here. Reporter: In their trips out, they wear a form of armor -- the suits of the cast of "Reservoir dogs." With their long hair and sunglasses, they are hard to miss, and in their first week out, new Yorker crystal Moselle spots them and does a double take. I was just walking down the street. All of a sudden it was six of them and I -- I ran after them. There's, like, nothing I could have done. Reporter: The brothers, who consider movies their religion, ask crystal what she does for a living. The first person they meet, and she is a moviemaker. It feels like fate. We shared the same passion. Immediately made a connection from there. Reporter: They arrange to get together, and soon the brothers invite her for dinner at their apartment. Crystal has no idea that she is the first outsider ever to be allowed in their apartment. You're actually our first guest to be invited over. Really? Yeah! Ever? Yeah. We've never invited anybody over before. Why not? Because we didn't have friends. He had revealed to me that, I was one of their first friends, and that was a huge, like, what? Reporter: You didn't know that. I was your first friend? Reporter: She gradually learns about the confines of their childhood, and starts documenting as they experience life on the outside for the first time. Their first bike ride. First visit to a restaurant. How's that salad? Reporter: That's mukunda five years ago. Very tasty. Very chemical. Chemical? Yeah. Tastes like a chemical. Reporter: And perhaps most momentous -- their first time at a movie theater to see Christian bale starring in "The fighter." That's awesome. That's exciting. I play that guy in "The dark knight." "Batman begins." Reporter: You also had a front row seat to them experiencing the world for the first time. Yeah. Reporter: What was that like? Oh, it was wonderful. They would express, "Oh we -- we've never been to the beach, you want to go to the beach?" I said, "Okay, let's go, I'll follow you to the beach." Reporter: At the beach, for the first time, they feel sand in their toes, the taste of salt in the air. It was kind of like this like baptism as they're like crashing in the water for the first time. Very beautiful. Reporter: How did they grow and change as they began to go out and experience life? They slowly learned how to interact with people. Nice to meet you. Where are you guys from? The only way I knew how to make conversation with anybody. "Do you like movies?" "Yes, I do." "What's your favorite?" "I like this movie." "Oh, I like that too." Reporter: Learning the art of conversation, and the art of moviemaking, crystal teaches them about cinematography. The tripod? The thing with three legs. Reporter: That's govinda -- one of the twins -- his hair long, dutifully taking notes. How do you view over what you recorded? There was something that was so open about them that you don't see every day when you're in New York City. Reporter: Crystal films for nearly five years. A friend tells her they look like a pack of wolves, and the nickname sticks. All the while, they become more accustomed to the outside world. Reporter: What were the differences between what you had thought life was like from watching the movies and what you really experienced life as being? One, not everybody's trying to kill you. In the movies, everybody understands what the other is saying and they have like a reply to it, but in real life it's like, "Could you repeat the question? Could you repeat?" I'm like, "I'm sorry, I didn't get it," and not everything -- not everything's a plan, in other words, in life. Reporter: Nobody's -- everybody's not following a script? Everything moves slower. Reporter: You need life to be edited a little bit better. Their freedom brings transformation. The youngest, jagadesh and krisna, change their names to Eddie and Glenn. And four of the brothers cut off their long hair. So cutting your hair off was a rite of advancing? Right. Like, it was -- Reporter: Leaving the past behind? It's like -- start like, "Okay, we are starting a new life. This is how I am moving forward." Reporter: Who did you see change the most over the course of the time you spent with them? I think their mother. Reporter: Really? The mother really broke free out of the situation that they're in and it was -- it was very beautiful to see that happen. I am not finding that place that has the donuts. That's what I'm looking for. Reporter: You've gone from living where you never were allowed to go out unless Oscar said you could, to now going out every single day. Yes. Reporter: She has changed her name too, from Angulo, back to her maiden name. It's very empowering, and I feel now like I've stepped back into how I really know myself. Reporter: Do you have regrets? Do you wish that you had claimed that part of yourself sooner? In some ways I have regrets, but in many ways it's been a journey for me. And I feel like -- it's been a learning process, and so I can't discount any part of it. Reporter: Mm-hmm. Because it's my life, and that would be like saying, "Oh, I wish I hadn't lived for those years," and I never feel that. Reporter: Her biggest step -- reaching out to the family she had cut off. In the documentary, she calls her mother, she hasn't heard her voice in over 20 years. I just, well, I want to say that I love you so much, mom. You know, I just love you so much. Reporter: That was very moving. Yeah. Reporter: That must have felt amazing to talk to her again. Yeah, I just am so glad to have her in my family and my life again. Reporter: Next -- crystal's documentary debuts. How has your life changed? Reporter: And a dream meeting -- with a man who had been a  This transcript has been automatically generated and may not be 100% accurate.
Part 3: "The Wolfpack" director Crystal Moselle spotted the brothers on one of their first trips out together.