Those "hitting the Shield of Wonder" rules are so needlessly complicated. There are already very simple rules for determining if an attack hits the defender's shield, Elli. It makes no sense for the defender to be able to make it more likely: they're already trying as hard as they can to make attacks hit their shield, that's what a shield's for. And "if you're not trying to block attacks with your shield then you don't have the shield equipped" needs neither spelling out nor special rules for it, either.