Board Thread:General Discussion/@comment-26475399-20160219233128/@comment-27836345-20160224234046

Yeah, now that I look at it on the wiki, it's pretty much the same thing.

Edit: And thinking back to when Ichigo fought Byakuya in the first couple episodes, when his inner hollow took over, I'm imagining that's basically what he did. Used his spiritual pressure to create a hierro.