The charges allege threats, but nobody is giving specifics except for the mention of a slave sale. The little else that has been told is that the kids made offensive jokes, memes and/or comments in Snapchat. The OP video insinuates they were planning (maybe only imagining) a mock slave sale of a schoolmate (or multiple). It isn't clear if they directly contacted the supposed victim(s) about this, or if this was chatter among friends that leaked.