The 'Quantum Step' was a powerful technique. So powerful, in fact, that not even a 7th stage Body Formation Knight could react to it.
However, with great power came with an even greater cost.
His Aubility Power was almost depleted. At this point, he could probably only use one switch at a time.
How do I recover my AP?
[Just rest,] Harbinger advised. [Aubility Power will naturally recover with enough rest. It will probably take you half an hour to return to your peak form.]
That's not bad, he thought. It would have been extremely bad if he could only recover his AP after a day's rest.
Though, this was also not ideal. If he became dead beat tired every time that he used his 'Quantum Step', then that meant that he'd be only able to use it as a last resort. A trump card, if you will.
That was still good, of course. Knowing that he had a card up his sleeve that would allow him to escape or engage at any time was a good thing to keep his peace of mind.