On March 30, the Philippines submitted a memorial detailing its arguments and evidence against China’s nine-dash line and other aspects of Beijing’s South China Sea claims to an arbitration tribunal at The Hague. The 10-volume, nearly 4,000-page document marks a bold step by Manila, and one that Beijing seems to have believed never would actually happen. The Philippines chose the right course. Now the international community must weigh in and convince China of that fact.