acts. if the las vegas gunman had placed some of that material down at the street level and aimed at it with the scoped rifle -- >> the binary explosives could have been detonated with rifle slugs from those rifles, from the 32nd floor. one for the effect of creating chaos among a crowd. and secondly, as a result of the explosion,wide spread shrapnel raining on the crowd. >> reporter: the implications are profound. considering how often these materials are simply used for unintended purposes. accidentally endangering and injuring people. >> is everybody ready? >> reporter: a lawyer for the woman taking this video says she was 150 feet away from less than 3 pounds of explosive target material. not tanarite, but a similar product inside a refrigerator. >> hey, hey, call 911.