Why is that further evidence? Transfigurations last for a time, whatever Hermione is transfigured into, she would not revert just because it stopped to be in contact with Harry’s body.
For the record, I think it very likely that Hermione is the glasses
It’s unfriendly in the sense that its values are not aligned with ours. I thought that’s what the U in UFAI meant. Luckily, it’s either not so powerful or not so misaligned that it will kill us all. But I think it’s more or less reasonable to say it’s unfriendly.