Here is the opinion in Jamulians against the Casino v. Iwasaki (Cal. App. 3rd Dist.):
Consistent with its litigation strategy in the trial court, the Tribe has declined to make a general appearance in this court as a respondent, but sought leave to appear as an amicus curiae (which we granted). Although the Tribe’s amicus brief makes colorable arguments in favor of its indispensible status, this is an issue on which the trial court must exercise its discretion in balancing several criteria in the first instance. We therefore will reverse the judgment sustaining the demurrer with directions to the trial court to address the merits of the issue on remand.