Galawain's Tusk region and story progression

[DarknessSephirothX]

I went and explored when I got here and found some mines
I went in and found teh inquisitor
I killed her before learning anything about the whereabouts of the garden
Now I go to the place where some giant magic tree sprouted and there is no dialogue referencing me killing the inquisitor
????
I also got bugged after killing her the first time and had to do it again just to get off the mountains.
This last area is strange.