Once upon a time, he'd been the one always cautioning her to not overdo it: to pace herself, not wear out her muscles beyond their capacity, to get enough rest. She wouldn't be an efficient weapon for the government if she wore herself into the ground. None of them would.

But it's easy enough to be a hypocrite, and so of course Luther's overdoing it today. He stops hitting the bag as Haru approaches, mops some sweat off his brow, and glances over at her. His closest thing to a little sister, in this world, with almost all his family gone.

"Some of them hold up better than others, but they're pricy. I should probably just take it easier on them. Kind of a waste, though."

It means he's always holding back, and never really getting to test his strength in full. It's frustrating.