I got anima without fighting her?

So I’m up to the part after I defeat yunalesca and Mika split. Now I’m doing some side stuff before fighting sin.

I wanted to get anima and the magus sisters and beat all the aeons at reniem temple. So I went out to get Anima. Had all the destruction spheres, went through and talked to Seymour’s mom, and left without fighting Anima, and I have the aeon now. is that normal? I thought there would be a battle?