A good combination of attacks to use when confronted with a sole enemy is first use dark flight to pounce onto the enemy champion then use the Ravenous Hydra's Active ability to deal some extra damage. At this point it is fair to say that the enemy champion has done some damage to you, so now is an appropriate point to use the Blade of the Ruined King's active ability to restore an significant amount of heath, as well as deal more damage. Your opponent will be very crippled at this point, and they may start to run based on how much health they have left you should either: a) Use Blades of Torment (E) to finish off the enemy champion if their health is low enough of, or b) Use Massacre (R) to annihilate them and then quickly find another target to attack while you still have the attack range and speed bonuses. If at ant point your prey begins to run, and you feel as though you have the heath to finish them, simply use Blades of Torment (E) to slow them down, and then --if recharged-- then use Dark Flight to regain ground, also if your target continues to evade you give them a nice lil middle finger and ignite them.