What Tears says is true. GK were talking about what makes Torben (1h) and Leed (lancer), Kerrigan (lancer), Chagan (lancer) and Jahboh (lancer) so effective on horseback. It's their ability to skip from target to target and always manage to pick the perfect one that's just not paying attention. They seem to be able to judge it perfectly a lot of the time, and know exactly where to put themselves to get the kill without endangering themselves to much. It takes a higher level of skill and awareness than most cav to be able to do that. They never get into duels, and constantly keep moving around the battlefield, if they miss a strike, they move on unless they know they have a clear cut kill. And no, they don't only kill easy targets, they often take out the higher level armoured targets as well. But it's that skill that takes them to the top of the server.