Something told him he'd only just scratched the surface with Remus. The way he moved was too calculated. He had time to think. Which was why Harry wanted to step things up.
Changing directions mid movement, Harry flicked his wand, a large ball of energy leaving it, heading for Remus. He followed up with a volley of various hexes aimed slightly to the sides of Remus, to take him no matter what direction he went to.