Oh and yesterday I saw my first PvP Penta, our team was dominating and had double the enemy kills even though it was 4v5, and our Yi just went berserk. His lifesteal and attack damage were barely enough to save him in the end; his health went down to about one twentieth or thirtieth. He then autoattacked the last surviving enemy to death, getting back up to a third of his full health in the process.
Good good good game.