attack gothens dremora doesnt agro the others.
The wiki says if you attack either dremora next to gothren all 3 will attack you without getting a bounty, but you can just kill each of them without others reacting.
(RM-1810 from redmine: created on 2014-08-13 by Austin Pitts, , closed on 2014-08-16 by scrawl .)