So this kid that's friends with my friend is getting bullied by another jerk who has also bullied me in the past (I beat him up though, so he stopped and that's another story). I'll call the victim Kid A because I don't want to use his name. He sits across from me at lunch, and he's about half my size and has a high voice, and he's about as physically and mentally mature as a 5th grade kid. He just looks really easy to pick on. Usually he's annoying and like to get in to arguments about something scientific with me, and he's always wrong, but he thinks he's obviously right. But then Kid B (the bully) is also friends with Kid C, my friend whos friends with A. B started to tease A by repeating what A says in a high, nasal voice, and putting pieces of food in his hair and stuff. Then he started to call him stuff (Can't repeat it here, it's really not PG13.) Now at my school that kind of stuff is normal in a joke format, but he says it in a mean way. Next week our school has a thing called "Time Out Day" where everyone signs up for a field trip type thing (skiing, bowling, movies...) and B and C are both going skiing, I'm staying home. A wanted to go with C, so he signed up for skiing. But A hasn't skied before, but B and C are really good and go down black diamonds. B told him that he was going to go on all black diamonds and leave A at the top of the hill, forcing him to go down and fall a bunch. He also said he was going to try and cut him off and get A to fall down/mess up, and video record it on his phone. That's when I got kind of mad. Then he said he was going to post it on Youtube as "[censored] Skier" or something like that. Now, I'd been bullied alot from 3rd grade until 7th, but I'm a whole foot taller than most kids so they don't like to mess with me anymore. A is small and, honestly, kind of wimpy looking. When B bullied me somehow the counselors got involved and B got punished, and I don't want to tell on him again because that'll just make me look like I have something against B (which I do, I hate that kid) and that it's none of my business. I asked my mom about what to do, she said there's nothing I can do. I said maybe I could sign up for skiing to back up Kid A, but it's too late to sign up now. I thought about hacking B's Youtube and getting it banned (he deserves it anyway) but I don't want to get in trouble with that. I'm really stuck, I hate bullies, and I don't want A to be picked on like that. Any advice?