User blog comment:Zathronas/Speculative author, Volume 3: Jaune Arc/@comment-3257939-20141120063640/@comment-3387274-20141120073323

Given that that flash obscurred everything that happened imediately afterwards, save that it resulted in Cardin being knocked flat by something, I see no confirmation that the semblance is a shield from that.

That said, I can not easily equate density control with anything related to Jaune's character, so I personally would kinda like to see the reasoning for that.