Golden Sun 2: Trying to reforge the Trident

Okay, so I’m playing GS2 again, and I’m currently at the part where you try to get into Lemuria. I’ve collected all three parts of the Trident, head to Champa- and Briggs isn’t there. Now, i KNOW he has to be there, since he’s what finally brings his grandmother out so I can get her to reforge it, So I must have missed something. Can someone tell me?