User blog comment:FairyRaven/Fairy Tail Chapter 314: Erza vs. Kagura, Review and Commentary/@comment-5201441-20130111143230/@comment-183.90.103.164-20130111162132

Hmmm, Erza's blood armor ... actually sounds possible. Just like how Gray froze his blood when fighting on Tenrou Island.

Maybe she was just waiting for Kagura to draw her sword and slash her, then turn the table (or battle) on Kagura with her blood armor?