Yeah, Leman Russ is essentially responsible for the destruction and near annihilation of the Thousand Sons in the first place, and is STRONGLY HINTED to be the reason why there are only 18 marine legions, not 20. First time he met the big E, he BEAT him in drinking contests and feats of strength, until the Emperor cheated and used a power fist (which only gave him a mild headache, from being punched by an anti-tank weapon, while being presumably un-armed or primitively armed at best) Say what you want, but the super-human viking werewolf knows a thing or two about kicking anyone's ass.