Talk:Countermeasures/@comment-25958024-20150113210916/@comment-397235-20150210221006

Actually, the novel explains it differently. Provided you're not at school or participating in a school activity, you don't have to ignore the person chosen not to exist. That makes it a lot easier for everyone, since it only applies to school. So if your sibling was picked to not exist, you'd still be able to talk outside of class.