Okay, I understand now Shadow's Mum.
Here's my relatively uninformed opinion on protectiveness versus fear...
Actually, I don't even think I can dare comment since I have never seen either of my dogs act in a way I felt was protective. I don't know what protectiveness looks like, to be completely honest.
Niko: American Showline GSD 5 years old
Rosa: American Muppet Dog (GSD/Border Collie mix) 5 years old