User blog comment:IamJakuhoRaikoben/Chapter 431 & 432: My sword is... & Brair in Love, Review./@comment-5668006-20150429052034/@comment-5668006-20150429151305

I think Mashima left it out on purpose to emphasize how fast she was, leaving even the reader unaware of when she had time to hit him 5 times. At least, that's how I interpreted it and think it's cool that way