User blog comment:Deafro/Dust and Aura: What is to come?/@comment-15108745-20130901195645/@comment-15108745-20130901212047

Perhaps Aura isn't the only thing that can trigger an energy release from Dust. As we saw, Ruby's sneeze was enough to trigger the release of fire, water, ice...etc. It's like how fuel in an engine is set off by a spark and combusted to run the engine. For Dust, the "spark" can be anything from Aura to some small physical force (depending on the concentration of Dust particles, of course. More tightly packed = more volatile = less of a spark needed to get a reaction)