CHICAGO — Kyle Rittenhouse’s lawyers have argued that he clearly acted in self-defense when he shot three people — two fatally — at a protest in Kenosha late last month.The success or failure of a potential courtroom self-defense claim, however, could hinge on questions about the teen’s actions before he fired and details that have yet to emerge, defense lawyers in Wisconsin said. As in other states, the law in Wisconsin allows people to use guns to defend themselves against serious threats, but there are exceptions to that right. One potential key issue: Could prosecutors show that Rittenhouse...