Board Thread:Speculation House/@comment-27121579-20160104011025/@comment-4010415-20160104020431

Glass is most likely not Cinder's Semblance, considering that Ruby said she believes it's not Cinder's Semblance. That was the writers' way of telling us "Hey, guys, that wasn't Semblance."

By the way, got screenshots that show that Cinder turned the dirt into glass.

And I think the shards she threw at Ruby in Dance Dance Infiltration were probably glass. The canister she emptied probably had sand in it or something.