I designed a magic system for this story that is based on two "styles", Flowen and DB style techniques. Flowen focusses more on physical abilities, while DB focuses more on pure energy.
In this case, the guy with the cape (to be named later) used a Flowen technique called "Imprisonment", which is meant to drop swords from the sky to create a perimeter around the oppenent, trapping them.
It should also be noted that each style has about 100 different techniques, which aren't necessarily based on power so much their difficulty. He used Flowen #3, therefore it requires little control.