[Reckless]

I went to Gnisis and entered Arvs-Drelen. After killing the rats and skeletons below, I got to the top and saw the daedroth. I killed it, without realizing there were others in the room, including Baladas Demnevanni. He attacked me, so I killed him. Have I messed anything up in terms of the future (especially the main quest)? I know he's Telvanni, but I'm Redoran. I just want to know if this is going to make future gameplay more difficult.