He briefly wonders if he's said something wrong at the way Mizu's expression shifts. Not that he had expectations for how Mizu would respond or react, but a strange look wasn't really accounted for and usually doesn't signal the correct thing has been said. However, before Vergil can begin kicking himself for fumbling with his words, Mizu indicates that it may only be a few days before they can do it again. He doesn't release the tension that crept into his shoulders though, uncomfortably folding his arms once more. That feeling of having said something wrong still eats at him, but he pushes it aside for now rather than dwelling upon it.

"You could bring books with you," he suggests. "It would give you something to do without exerting yourself too soon."

Mizu is clearly too stubborn to fully and completely rest as he probably should even with his healing ability. The fact that he was willing to lay down and sleep at all today, and the simple fact he's still seated now after a bit of minor exertion is nothing short of a miracle. But perhaps he would be less eager to bolt before he had enough immediate recovery to manage independently if he felt like the time at rest wasn't such a waste.

"We also do not always have to spar like this either. You said as much yourself that there are other ways for you to improve than merely fighting me. You also previously assured me before you'd improve your hand-to-hand. Neither time with Mirage Edge nor hand-to-hand ought to leave you unable to make use of the rest of your day."