Gon and Killua were both sucked into a portal 2 years ago, but what they didn't know was that they've been near each other the whole time. Gon didn't know why people thought he was smart. He was dumb as hell and took notes because he kept forgetting things. He had actually created a calculator with his Nen that nobody could see for that purpose. People would ask him things like, "hey Deku, what's 7x9?" or, "hey Midoria, what's the average number of bystanders at a crime scene?" he always stayed calm and smiled though, being mad wouldn't solve anything. They just got back from internships and he managed to come up with an excuse to be stronger now! He altered his Nen a little to make green lightning thingies and it reminded him of Killua. It wasn't actual lighting or electricity, just for a little flare and to make it look like he took a step up. I have to pretend I'm getting stronger like everyone else.