User blog comment:FairyRaven/Fairy Tail Chapter 389: The Twin Dragons vs. The King of Hades, Review and Commentary/@comment-24467372-20140620102338/@comment-7418318-20140620110723

They weren't present when Erza beat up Minerva, so they might think that all those bruises came from Mard, rather than Erza.

Or Sting might be presumptuous enough to call Fairy Tail his friends. Mard's servants certainly hurt Fairy Tail and the whole of Magnolia quite a lot.