User blog comment:IamJakuhoRaikoben/Chapter 412: Dance Unto Ishgar, Review./@comment-24729244-20141208165030/@comment-9595671-20141208165221

I don't think he will, I don't think its been a year yet.

Considering that info, I'm pretty sure Natsu warned Rogue. Though with the shock Natsu gave I'm not sure he mentioned who was the culprit.