Regardless of how high standard both parties were, they weren't be able to conceal such facts from the few people present. They represented the Federation's ultimate strength and authority, it had been an extremely long time since a fight could attract them enough to enter the OP.
Papada's offense grew increasingly fierce as his attacks grew increasingly concentrated. The key to a drawn out fight was to maximise results with minimum input. Although All Mouthy King's impermeable defense looked spectacular, whether it was the heavy greatsword; the physical consumption; or being in this fiery, hot environment while being chipped away by Papada's special ability attacks, it was exceedingly unfavorable for All Mouthy King. Even experts of the Sanctuary Division would be forced to the point where they could only passively defend against the onslaught of attacks.