User blog comment:Emptylord/Sandbox/Custom Patch Notes/@comment-1330314-20130816162840/@comment-3974211-20130816174444

Yes, but since it is unaffected by Lethality and Infinity Edge, why complicate things by calling it critical damage? It's the same reason why I said Pantheon's Q should just say "deals bonus damage", and the same reason I'm not going to make Vayne's Tumble classified as critical damage.