Today with my guild I managed that you can enter second lockout of Baradin hold if you'll set Heroic Mode. Tested it on 10 ppl. We killed Argaloth as a guild raid, but achievement didnt show up, so the banner on the minimap was with "0" on it. After it we went out of instance and, set normal mode and entered Argaloth was there alive againSo I guess you can kill all the bosses of BH twice and maybe this will work in some other instances. Need more testing.