User blog comment:Mamerge/What if Natsu is END? And Silver is Future Gray?/@comment-117.233.1.90-20140411120036/@comment-7418318-20140411123046

I wouldn't interprete too much into that one succesful punch. Even Freed managed to punch her away a similar distance and look how that ended.

Okay, granted it was in Satan Soul, rather than Sirti, but then Sayla's surely a lot stronger than Freed.