Memo to the visually challenged in Skyrim: Don't dress in rags and hang out with bad people. Go talk to the Skyrim Association for the Blind and get on one of their Safe, Independent Living in the City programmes.
Lol, I killed Illia on my first character for that very reason. Got it right this time round. But I agree with the dress code. I keep hitting Farkas or Vlikas in those dark dungeons, and why? They are dressed and even sound like the Silver Hand or bandits. That and the fact that they deliberately get between me and my target, sigh. I've also killed a few hunters at range, but I now know the signs to look for.
Back to the topic of seeing weird things at this late date. The other day I needed to get to Ysgramor's tomb, so I started west out of Winterhold and went over the pass. I could see some fighting going on ahead. It was some bandits and a conjurer. I think they were all hostiles, but so absorbed were they that they took no notice of me. That wasn't odd, though. Last night I took the same route on my way to Saarthal. I came across the weapons dropped by the bandits, and just then I perceived a new altercation through the blowing snow. I could see some flashes and heard the growl of a troll. Well, I stumbled across the troll corpse, but whatever had killed it had moved off down the hill. So I crept forward and found... spriggans! Spriggans, in an ice field, without a tree in sight. The cold must've sapped their strength, haha, 'cause they dropped pretty quickly to my sword.
But spriggans... nowhere near any grove. Maybe I have seen everything.