Board Thread:Off Topic/@comment-25396609-20160923220030/@comment-26397825-20161103043827

It doesn't "burn through" aura. It uses aura. It's a limitation I put in the semblance; activating the semblance and using the dust still takes the usual amount of aura/stamina that doing so would for other people, and the bonus aura is temporary and usable by the user but ultimately separate from their own. They don't use their own aura when using up the aura generated by the semblance, they use the temporary aura first and foremost.

So really, activating the lightning dust would drain a little bit extra aura, but wouldn't make them crash and burn. Otherwise everyone who uses dust would crash and burn after every activation of dust for interaction with their semblance.