Board Thread:General Discussion/@comment-23988977-20131108010007/@comment-16502426-20131108052732

Going back to the talk of Blake's after-image, it would appear that it's more than just an image. It may actually even be physical:

Roman lands a solid punch, but Blake backflips out of it and continues as if nothing happens. It seems that he actually hit her after-image.

This would suggest to me that it is indeed her semblance, as it would be a rather odd thing to just happen as a result of raw speed.