>> tensions build with each passing second. then in an instant, the child is hurdling through the air. >> she came towards the edge and she looked down at me and she grabbed the bottom of her t-shirt like a parachute and she just went forward. >> the girl tumbles three stories down. st. bernard lunges. >> the weight took us both to the ground. i was sweating. tears was about to come down, but i held my composure. and she looked at me and she smiled. >> the little girl is unharmed. neighbors find out that she's a special needs child who didn't realize the danger she was in. st. bernard is thrilled she's fine, but the good samaritan's actions come at a cost. >> my arm was swollen. it was stiff, i couldn't move it.