"Hey, Washington Supreme Court: Did you see how great the Oregon Supreme Court was just a couple of days ago when we certified a question to them? Here's your chance to show us you can do the same. Get this complex, difficult state law diversity case off our docket, will you? We'll love you if you do. And you don't want your competitive neighbor, the woodsy Oregon Supreme Court, to be better than you, do you?! So show us what you've got, baby!"
That's basically what the Ninth Circuit panel does here.