Arthur returned Diana's grin, smiling even more at her mention of her bouts. The Amazonian's training matches against her Leaguemates were legendary, equal parts instuctive lessons and brutal humiliations for her friends. Aquaman himself had been known to test his skills in the leagues halls before, usually under the tutelage of Batman or Hawkman, but had been finding less and less time for it lately as his responsibilities as king of Atlantis began to pile higher and higher. 

"I would enjoy that Diana, though I think any competition between the two of us would soon become slightly un-friendly. We both enjoy winning too much!" he winked, robbing the quip of any real venom. 

Walt interjected with a story of his own, his mouth running a mile a minute. Arthur stood with a slightly bemused expression on his face, struggling to keep up with the shapeshifter. Finally Walt finished his story, but Aquaman was no more certain now of what had happened than he had been at the start of Shifter's story. Instead he settled for a good natured laugh. 

"Outrageous," he chuckled. "Now, if you both excuse me, I need to see Jonn about the issue of a sinking drilling rig. Atlantis demands retribution, and I believe it could soon become a problem for the League, not just Atlantis's king. The work of Royalty never ends, eh Diana?" Aquaman left with another smile, walking through to meet with the Martian-Manhunter.