They find David and Sam! And find out that they were involved!

"Wait, someone's up in that vault room up ahead!" Izuku whispered, grabbing both Bakugo and Melissa and pulling them back around the corner. Ignoring Bakugo's snarling, Izuku peeked around the corner and paused. "It's your dad and Sam!" he hissed to Melissa.

"What? Why would they be up on the top floor?" Melissa whispered right back.

"I don't know," Izuku shook his head. "But the Villains must have needed them for something related to their goals..."

"Isn't that some kind of Vault area?" Bakugo asked, also peeking around the corner. "It's obvious that the bastards are trying to get some kind of research that would be valuable to the criminal underworld. And they're using the Professor and his partner to unlock that Vault..."

"That would make sense..." Melissa agreed with Bakugo, before looking at Izuku. "We have to help them!"

"No shit," Bakugo grumbled as Izuku nodded, and they began moving towards the Storage Room. As they approached, they heard David's voice echoing through the hall.

"I've unlocked it. Vault 1147," he told Sam, his voice containing a hint of rage.

"Good!" Sam nodded, before rushing to retrieve what it was. Upon pulling it out, he opened the briefcase to show some kind of headgear. "Here it is. Now I finally have our research back!" Sam enthused as David turned to glare after him, clenching his fists.

"I hope it was worth it," he stated bitterly, making the three pause just outside the door. Sam was involved in this fiasco somehow?

"You shouldn't be so angry with me, Professor," Sam replied, returning the bitterness. "You were just as involved in the plan as I was, until you decided to back out because All Might showed up. But even with him here, the Villains were able to pull all of this off without a hitch. We had nothing to worry about."

"That isn't the point!" David shot back. "This whole venture was folly from the get go! It's true, it took All Might's arrival for me to realize that this plan wasn't even necessary, so I called it off, and you went ahead with it anyway!"

"...Papa?" Melissa asked, walking into the room, shocked at what she was hearing. Both Sam and David froze, and turned to see her, flanked by Izuku and Bakugo. "What are you both talking about? You... were the ones behind all of this?" she questioned quietly. "No... it can't be true!"

David gave Melissa a pained look, before turning his head aside. "Yes, it's true... until today, I was involved in the plan to steal this device."

"Oh, you two faced bastards... I'm gonna kick both of your asses!" Bakugo snarled, stepping forward, before Melissa stepped in his path. "Outta my way!" he snarled.

"Why!?" Melissa demanded, giving Bakugo enough pause to at least hear the details out before he started blasting again.

"We simply wanted to get back what was stolen from us," Sam replied, holding up the briefcase. "The device in here is the culmination of years of research. It contains a device capable of ampliyfying Quirks manyfold, without any side effects, unlike ****."

"...what the hell?" Bakugo blinked, actually taken aback by that particular revelation. Izuku couldn't blame him, that sounded almost too good to be true... so why was it locked away?