and then 15-year-old mukunda opens the front door. down the 16 flights of stairs. >> my heart started pounding as i was going down the steps. >> reporter: and out into the air. >> the moment i opened the door, i was like -- >> reporter: outside without his father for the first time in his life. >> what do i do? i'm out in the open, it's all out there, there's no going back now. >> reporter: he doesn't even know his own address. >> i'll know how to get back as long as i keep the building, our building in my sight. >> reporter: so you just kept looking back here sort of as your touchstone? >> mm-hmm, yes. >> reporter: but you kept walking. >> i did. and as i recall, i, i knew which window was ours and i saw my brothers looking out. >> reporter: you came out, turned the corner, turned left. >> i turned left, yes. >> reporter: turned left. were you nervous? >> really nervous. >> reporter: still wearing the halloween mask, he goes into a bank, a supermarket, he is terrified, and terrifying to those who see him. it doesn't take long for som