>> but it wasn't the police. it was a canyon man named abdul haji, the businessmen and father of four had received a text message from his brother earlier that morning. >> the message was very brief. that red, at west gate, terrorist, pray for me. >> abdul haji boulder to the mall and was stunned by what he saw when he got there. carnage, everywhere. he was terrified for his brother, who works for the canyon intelligence service and had received death threats from al-shabaab, the same terror group that is now attacking the mall. >> at this point in time, the magnitude of the whole situation dawned on me. >> security forces were just arriving, and abdul who is licensed to carry a gun, decided in an instant to join them. they entered the mall from the parking garage on the top floor. abdul's brother was still in the mall and actually not far from catherine walton and her girls on the main floor.