About as well as predicted!

After everything has been set up, Nezu brought Izuku out towards one of the training fields, with Aizawa and Cementoss present, as well as Recovery Girl. "What are you both doing here?" Izuku questioned when he spotted the former two.

"Me, I'm here in case you come up with something you might want targets for," Cementoss replied. "I'll produce them with my Quirk for you."

"As for me, I'm here because I'm your homeroom teacher, and want to stay updated on any new ways you consider to use your Quirk. Any new developments, I want to know," he drawled in his usual bland tone. "Also, in case you start harming yourself and lose control of it, I'll be able to shut it off."

Izuku gulped at that particular thought. "Does... Does something like that happen often?" he asked slowly.

"Oh no, not often~!" Nezu chimed cheerfully. "But it is better safe than sorry!"

Izuku gulped and took a stance a safe distance from the four teachers. Recovery Girl and Nezu knew about One For All, but the other two, as far as they were aware his Quirk was just the ability to manipulate energy his body built up, which was close enough to what One For All was that most things he could try wouldn't raise any eyebrows. "...okay, the first thing is whether I can channel the energy outside my body at all... I'm a little uncertain whether that's actually possible though..." he said slowly.

"I think it is!" Nezu noted. "Surely you noticed something that happens when you use your Quirk over your full body, haven't you?"

Izuku blinked and stared at Nezu. "Um... What?" he asked cluelessly.

Already figuring out what Nezu was getting at, Aizawa slapped his own face with his palm. "...for someone so good at analyzing the Quirks of others, you seem to suck at assessing your own. Didn't you ever question those streaks of green lightning that surround you?"

"...oh, right!" Izuku realized, face palming himself for missing something so obvious. The lightning didn't seem to do anything, but that was just One For All's energy leaking out. So now, it wasn't a question of whether it COULD exit his body, but whether he could push more out for some purpose or another. The obvious thing to try would be to see if he could fire off an energy blast like a DBZ character.

He closed his eyes. Nezu had reminded him earlier to try to visualize, and his mind went to the egg in the microwave again. He extended a hand, and this time, he altered the visualization metaphor a bit. He opened the microwave in his mind, channeling five percent, starting a little slow, extending a hand out as he did, pouring the energy out gradually. A green ball that started sparking started to form... Only to rapidly expand, and his eyes widened. "Oh shi-!"

.....

"Damn it Hatsume!" Power Loader shouted out of nowhere. "I told you to be care..." he trailed off as he realized that no explosion had occured in the Studio.

"I have been!" Mei shouted back, a bit indignant. Indeed, far fewer explosions had been caused by her lately. Power Loader didn't know why, but he sure as hell wasn't complaining.

"...huh, I could have sworn an explosion of your making happened somehow..." he paused, looking sheepish, and noticing a lot of his students were giving him odd looks. He cleared his throat, and immediately got back to work on grading papers, muttering to himself about the paranoia Mei had given him.

.....

"...ow..." Izuku groaned, laying on his back, smoking.