this is blaise walton.him to recount the story of what happened to him and his brother. but he wanted to tell it, starting from the beginning. the two brothers had just paid and were still standing in the checkout line when they saw something strange. >> what's the first thing you hear or see that is weird? >> everybody looks to the main entrance. and, we all look, as well. everybody, in nakuma, and then a loud sound happens. three people go flying. that's when people realize what is going on and they run. >> reporter: three people going flying into the air? >> just fell backwards. just went -- it was scary. >> reporter: did you think it was a bomb or something? >> i thought it was a bomb at first but then when i heard the two gunfire sounds i knew it wasn't just a bomb. it was something else. >> reporter: he knew he had to protect himself. more than that he knew he was responsible for his younger brother. >> reporter: you grabbed your brother, fast as you could. >> yeah. and just ran. >> reporter: were you

she said, find blaise. >> paul texted blaise but he didn't answer. >> i started looking on the internetdy put 0 a statement on facebook saying don't call anybody. the people are shot when the phones are ringing. >> oh god. paul stayed in connection with katherine through text messages, the lifeline to the outside world. >> i sent a text, get me out of here. like i thought he could. i was desperate. >> my heart just sunk. >> katherine didn't text her husband filip because he was too far away to do anything. back in north carolina, all phillip could do is wait. it was 6:00 a.m. and news of the attack hadn't hit the u.s. yet. >> i'm trying to imagine the feeling of getting that phone call. and being so far away. >> i think helplessness is a pretty accurate word. you know there's nothing that you can do. i was so worried the girls woul uncontrollably panicking and drawing attention. >> exactly what katherine was trying to prevent the girls from doing. >> i just kept telling them to stay little, to stay very quiet. and that the kenyan lady that was with porsche kept patting her and soothing