User blog comment:FairyRaven/Fairy Tail Chapter 325: Unity, Review and Commentary/@comment-7418318-20130329124348

It does seem a bit risky to stay in the arena with fighting mages. Even without intent a stray magic attack might kill him.

I wonder if he really was inside that costume or wether Mato is actually some kind of puppet or golem that is remote controlled by the King... or a psychic projection/illusion with mass (like Siegrain or the "members" of Caith Shelter).