Blaidd aggro towards me and now rannis not in the tower

So I started rannis questions and spoke to blaidd in the siofra river well area. I then spoke to seluvis and then I fought radahn but blaidd wasn’t at the castle.

After defeating radahn, blaidd doesn’t show up near the grace sight so I go back to the siofra river well and now blaidd is aggroed and starts attacking me. I killed him cuz I didn’t know what to do. Now when I go back to ranni, she’s not there in her tower.

What do I do? And why does this happen?