User blog comment:Omega natsu2/Fairy Tail Episode 197: The Time of Life, Review./@comment-1359322-20140830040627/@comment-108.28.233.191-20140830051448

The Erza bit is pretty easy to write off. A rush of adrenaline to help kill the pain during the fight, then once all enemies in the area are eliminated, it starts to wear off and the fighting has exacerbated the injury again.