Yes, and it is! Though... Not as much as he hoped!

"I'm going to try a higher percentage," Izuku announced, making Nezu smile.

"Ah yes, it might be that discharging the energy is less strenuous on you than actually hitting something with it," the diminutive principal nodded. "Go ahead and give it a go! Let's see how high you can push it! Just remember, take it slow."

Izuku nodded. He could handle six percent through his arms currently without damage. So, a fair test amount was ten percent. He once again channeled the power as Cementoss repaired the cement wall. He fired it off. This time, the wall was almost completely collapsed by the blast. No damage to Izuku's arm.

"Right, making a thicker wall now, if you think you can go higher," Cementoss nodded.

"By all means... I'm trying twenty percent now..." Izuku nodded, keeping his arm pointed. Wall came up, and Izuku fired again. Still, he felt no muscle tearing or bone breaking. It was at this moment, Izuku got excited... And unfortunately, a little too cocky.

When Cementoss prepared yet another wall, Izuku made an erroneous estimate of how much of One For All he could handle with this method, and jumped straight up to fifty percent. "Here goes!" he shouted excitedly.

Nezu's eyes widened as he realized the amount fired was a bit more than expected. He had expected Izuku to try thirty percent next... Which, funnily enough, would have been his safe limit, at about five times the amount he could use and actually strike with. "Wait, Midoriya!" he yelped, but true to his earlier words, the energy had already been discharged... And this time, there was an audible crack with the recoil as Izuku howled in pain.

Naturally, the blast obliterated even the thick wall, but no one paid attention to that. "YOU ABSOLUTE, BONEHEADED, IDIOTIC, DUMBASS!!!" Recovery Girl roared, striding forward with a speed that belied her age. "What the hell were you thinking, jumping to such a high percentage!?"

Izuku opened his mouth to answer. "Well..." he said slowly. THWACK! He yelped as she whacked him upside the head with her cane. No one there dared comment on how counterproductive that was.

"That was a rhetorical question, you nincompoop, because you obviously weren't!" she seethed, pulling out a hand held medical scanner, and running it over his arm. It beeped, giving her a diagnosis of his radius and ulna being cracked, though thankfully not broken into two or more pieces each, and several torn muscles. "Honestly, the way you reckless young ones are going, I'm going to have to figure out the secret to immortality, not because I want to, but because if I don't, you lot will all die the very instant I do!"

"Again, that's why we start slow," Nezu shook his head as he repeated his previous words. Recovery Girl's bedside manner was usually a lot better than this, but then again, she had been known to start losing patience with those who had to see her too often.

Izuku cowered a bit as she proceeded to use her healing Quirk on him. Recovery Girl might be even scarier than Nezu when she was mad! He grimaced. Once again, he considered that maybe the confidence he had gained from his relationships might not be a one hundred percent positive, given his cockiness in that moment. Not to mention how well the test had been going, despite the initial hiccup, giving him a false sense of security.

Still, ending aside, Izuku saw the day as an absolute win. He'd have to test the limits again, albeit much more carefully, at a later date. And take the fresh lesson not to get too big a head, lest it bite him in the ass again, to heart. If only to avoid incurring Recovery Girl's wrath further. He'd pushed his luck in that regard far enough, thank you very much.