The manual gives little detail. I am curious about any ideas on HOW it makes it them harder to hit, suggestions on altered strategies, and other factors that may change. For instance, I have been using Guardian Angel and running when I almost never did that on Normal level.
It took me several tries to get away from the Juggernauts before I thought of lowering the difficulty. Instead of chasing me from almost to the cemetary all the way back to Arnika (expert), they gave up in a couple rounds (on novice). To me, that implies something a little more intricate than, "the difficulty setting affects how likely you are to hit enemies and how likely they are to hit you"