I noticed several occurance of this problem in Dreadfell with various characters, and now while running a Cornac Anorithil i ran into it again :
In some Dreadfell levels, you have often a closed rectangular room that is not considered vault but when opened are filled completely with various undead.
And sometime there's one or more Emperor Wights in it.
So you manage to beat them all but noticed you're still on the recieving end of some lightning attack from an Emperor Wight, despite all of them have been destroyed with 100% certainty.
When you walk out of those rooms, no more attack, when you re-enter , again the lightning assault continue, as if there was an Emperor Wight here that was totally immobile (so he can't attack you when you move out of the room), despite there's none, you destroyed them already.
