I was exploring the area with the knights that sit down and don't attack unless you aggro them, I reached a certain point where there were three giant green soldiers guarding an entrance to the left, right and one of them was in the center. So I tried luring the one in the center away from the area to focus on one of them at a time, I manage to kill him. However, even though I didn't aggro the other two green giants, both of them were approaching me. I run past them and I see the knights who aren't hostile were standing up and patrolling the area, I suddenly remembered I killed the old dragonrider which makes the knights hostile for some reason. So I decide to run past everything to get to the red dragon guarding a lever, I believe? I look behind me and see three knights and the giants chase me this far, and the dragon starts breathing fire. Why are the aggro ranges so long in this game, and I don't even think I was supposed to be in this are yet. Anyway, I had enough of ds2 at this point, maybe someday when I'm bored I'll try it again, but I'm enjoying Sekiro much more at the moment.