Yeah some times when i fast travel, and its completely random, something comes with me and all the guards and townspeople kill it instantly. The most recent thing was a Falmer in the middle of Windhelm. I have no idea why it happens.
asingel falmer is one thing, but a spriggan matron, 3 bandit marauders, 2 apprentice necromancers, a wild frost atronauch, 2 forsworn ravagers, and several other enemies that died before i could even check what they were is another, it happened every time I tried travelling to whiterun from riften via carriage, even after completeing quests and coming back for another try. And that horse, was not mine, it just follows me for some odd reason >_<