So I was on my Alliance Dk and I got a titansteel destroyer and while I was helping a friend level his shaman i noticed that Blade Barrier leveled my weapon skill. So the whole time I was helping my friend out I was just spamming Blood boil and leveling my weapon skill at the same time.
I'm not sure if its a repost I didn't find it while searching it and I don't care I just signed up to this site just to post this and help out a bit.
Also for people who don't play Dk Blade Barrier is buff you get when your blood runes are on cd and the dk takes 5% reduced damage.