I walked Gwyn almost the whole island, of course, the reachable parts without special keys or high open lock. He was never spotted, for he has ridiculously high stealth checks. Well, this is not the bug part. In the bogs, some jelly spotted him. Well, that was alright, I was prepared, drank an invisibility and went back on stealth. Well ... Suddenly I start being chased by all sorts of creatures in the bog. While invisible and in stealth mode (triggered after becoming invisible). Well, I entered lairs, and none chased in. Phew ... I finally get a rest, cast camouflage agan, to make sure, drink another invisibility potion, to make more sure, and when I leave lairs ... Guess what ... All the mean creatures of bogs still chasing me. Deadly vines, jellies. They seem to lock the trarget on you, and chase no matter what. Well, end of story, he did not fugue or became uncontious, but I had to log out, for this was not fair and product of a bug that would harm me if I did not log.
Not a bug afaik. Assassin vines and oozes do not rely on eyes and ears to detect their pray.
Not very good form to log out in those situations either! >_>