Well according to the wolrd of remnant video on dust, all usage of dust is triggered by aura, with the possible exception of coughing it up. I think dust is volatile by nature, regardless of how you use it. But the video mentions the need for discipline to prevent accident when handling raw dust, which Diamond would have. Besides, it's not like I plan on that becoming her main weapon, it's there to eliminate the melee-only disadvantage when needed. Oh and don't worry, noone's getting exploded. Flash-frozen on the other hand... =D