Eraserhead and All Might finish watching the message and find out that Mei Hatsume had created a device that could send anybody into the past using Eri's power. Eri had managed to master her ability over the years and could now do incredible things.
So, the Bakugo from the future had managed to travel back in time and deliver this message, along with the other stuff.
As the two teachers are absorbing the details from the projection they just saw, a dark figure decides to reveal itself.
The man had been watching the two for quite some time now.
He slides the already unlocked window to the staff room and jumps inside, making little to no sound. Still, Aizawa's sharp eyes are quick to stop him.
As soon as the intruder's feet touch the ground, Eraserhead whips out his binding cloth and tries to hold the attacker in place.
The man elegantly dodges the attack, leaping from the floor and onto Aizawa's desk, messing up piles of assignments and books, making papers fly everywhere and stationery fall every which way on the floor.
"Who are you?" Eraserhead questions, looking at the man with annoyance.
The man's face is not discernable to the long hood of his sweatshirt covering most of his face. He smirks as black tendrils emanate from his hands and wrap themselves around Eraserhead's body, elevating him from the ground.
"What the-!?" Eraserhead manages to mutter before the tendrils wrap themselves around his mouth, silencing him. He struggles against the holds and looks at his colleague, trying to signal to him with his eyes to get help immediately.
All Might quickly rushes towards the door. Just as he opens it a black tendril slithers towards him, entwining itself around his left leg and lifting him off the floor.
"Not so fast." The intruder says with an amused voice. "Let's chat first."
The voice is very familiar, making All Might narrow his eyes at the man.
"What do you want?" All MIght asks, voice full of suspicion.
He has grown up quite a lot. A long, angry, red scar runs along the right side of his face, from his forehead, to his jawbone. His eyes hold the same arrogance that they did when he was 15 but there is a lot more wisdom in them too. He is taller and more buff now, and even though his appearance has changed significantly, there is no mistaking that this man is Bakugo.
"I can explain." He says looking down at them. Eraserhead still looks annoyed and All Might is deep in thought, staring at him.
"Get down from my desk first!" Eraserhead snaps and Katsuki leaps off the table, muttering, "Whatever." under his breath.
"I would ask. 'Where are your manners?' but I forget you never had any in the first place." Eraserhead says condescending and bends down to gather his belongings from the floor. He then looks up to glare at Katsuki again, "What? Are you just going to stand there and watch? Help me pick everything up!"
"Fine…" The grown man mutters childishly and proceeds to help his former teacher with a pout on his face.
"How did you do that?" All Might asks him as he's helping Aizawa.
Katsuki looks up at him and frowns, "How did I do what?"
"How did you manage to grab us like that…? I don't recall you having that quirk." All Might looks at Bakugo intensely.
Bakugo blinks once in understanding, "Oh… that…" He then looks at the papers in his hands, as if trying to find the answer from them.
"It was like the power we saw Midoriya with during the match with class B. '' Eraserhead comments, also staring at Bakugo.
Several seconds pass between the three of them in silence, with Eraserhead and All Might trying to ponder over the new power in their heads and Bakugo trying to formulate a response that wouldn't send his former teachers over the edge.
"This is sort of a new quirk…" He says in a reserved tone of voice, not really wanting to elaborate.
"What happened to your ability to cause explosions?" All Might asks, his curiosity growing with every passing moment. There was so much he wanted to glean from this future version of Bakugo: the strange things in the suitcase; the toys, the videos, and the Mangas.
"I still have that, but now I can also use this new power that allows me to grab things from my surroundings." Bakugo replies, wishing they wouldn't ask him to get into the details just yet.
"How did it happen? Has your quirk evolved?" All Might asks next. His brain was already trying to find possible explanations for this new development, but none of them seemed to make any sense.
It is not common for a quirk to evolve like that, especially since both of Bakugo's powers are so different. They couldn't have stemmed from each other. It was possible that maybe one of Bakugo's parents also had this quirk, but if that was the case then he would've exhibited this power earlier on when he was a child.
What All Might knew but didn't want to consider in detail was the possibility that somehow this quirk had been transferred to Bakugo, because the thought was oddly unsettling and tightened his gut.
He knew that Izuku had tried to do this before during their safety program at Nabu Island, but it hadn't worked because the both of them had passed out before the transfer was complete, allowing Bakugo to use the power but not gain full ownership of the quirk.
Eraserhead beats him to it.
"Did someone pass it on to you?" He asks, standing up and organizing the assignments in his hand.
"What?" Bakugo asks, baffled. He didn't think that it was possible that Mr. Aizawa already knew about the truth. How much had he read and watched?
"It's true, isn't it? Midoriya gave you the quirk." Eraserhead says plainly, voice betraying no emotion. "I figured since All Might was able to transfer his quirk to Midoriya, he should be able to do the same…"
"How much do you know?" Bakugo asks quietly and Eraserhead sighs.
"I think I know enough… I went through some more of the books too. I can see why All Might is reluctant to tell me everything but it's going to be much easier for us to navigate through this if you'll let me know what's happening.
"I understand that, and I apologise for keeping this from you for so long." All Might explains, "I only wanted to protect young Midoriya… Honestly, I would rather Bakugo had not known about it either, but Midoriya wanted him to know."
Bakugo reluctantly admits, "Yes, Izuku gave it to me a while ago"
"You're handling it really well!" All Might says encouragingly, thinking about Izuku going out of control when he used it for the first time.
"Of course!" Bakugo says snottily, "Who do you think I am?"
Aizawa snorts at his response and motions for Bakugo to hand him the rest of the papers. "Anyway," he interjects, "How the hell did you get here?"
"Well… That's sort of why I interrupted the both of you." He responds sheepishly. "I came back from the future to pass along these things and I can't go back the same way I got here."
All Might's eyes widen in concern and he questions, "How?" while Eraserhead only grunts in annoyance.
"And you didn't think about that before you decided to embark on this journey!?"
"Well, it's a long story…"
"We've got time." All Might says with a warm smile, ignoring Eraserhead's glare. "And you can also offer an explanation for the things we just saw on projection and the manga
"Sure…" Bakugo says, dreading the conversation he was going to have.