Essentially its meant to use in tandem with physical attacks like the ability Explosion is (only Explosion activates at the end of a combo and blah blah blah) and could be used at the same time with a blade attack or slammed into the opponent with the hand right after the attack, some combination of both, etc. 

Its kind of like Ronan's 1st job (Spell Knight) or 4th job (Abyss Knight) attack combos from Grand Chase only without as much grandeur like Ronan's fourth job has (mainly cause Oner doesn't wield what I would say is the equivalent of a rapier (the Keyblade's shape has never really given one options for style or weapon choice as it is more like a shortsword or a longsword, but that's not the point, although if Oner could wield a rapier keyblade that would be pretty awesome).