So I just finished Laid To Rest, when initially going into Alva's house to find her journal, I did not kill Hroggar, instead exiting the house while he was begging for his life.

I then went to Movarth's lair and cleared it out, weirdly Alva was there, but not hostile to me..so I let her live, as it appeared that killing her resulted in a bounty, and even weirder..she was fighting the Vampire Thralls in the lair.

So I head back to town triumphant, then I mess around Morthal a little while. In just a bit who comes strolling in but Alva, I follow her to her house and she says 'hey handsome' and walks inside. Following shortly after her is Hroggar, who makes sure to tell me how thankful he is that I saved him from Alva's evil plan, and how he will never outlive the guilt of what happened to his wife and child. Then,, he goes straight in Alva's house after her presumably to drown his grief and guilt in some sweet vampire lovin'.

If I follow them inside, the both attack and immediately I get a 1000g bounty without having attacked anyone!

Not game breaking, and I don't even mind the bug as it's actually kind of funny. Just wondering though, is there some other option or way of finishing the quest that i'm missing?