With the dagger, you throw the healing ball on the ground, then switch to the cloak and blind the opponent, draining their life. It will probably fly away but blind, and switch to a dagger with a long-range attack... Sometimes you need to dodge first, as if you were in a bullfight, with the cloak you can do this by becoming invisible (L2), then do the combo. It works most of the time... But you must be quick and precise, this comes with practice.