[And that's a perfectly sensible and logical conclusion, so four for you for having logical conclusions and not having skimmed the Ye Olde Middle Earth of wikipedia for cross-dimensional spoilers.]

Some of them tried to kill me. I tried to kill some of them. [Said in the same way one would say, "I had to shank a dwarf for my boss, but work's work and the dwarves tried to shank right back."] I ended up working together with one of the ones I tried to kill, so it depends on what you mean by friendly. But I know spirits well.