(note, Radec is not in his full bodied diamond form... he's just using a diamond sword and the crystal dust)
Radec-sensei: *the crystal dust suddenly rushes in, forming a small defensive wall (similar to Gaara's sand), which dissipates most of the wind blades. Radec parries away the remaining wind blades, although one manages to graze his left shoulder, ripping part of his Akatsuki cloak's sleeve. Radec then barely manages to Block Mugen's impact, and it causes him to be pushed back, feet dragged. Their impact causes a strong shockwave that ripples around the training area* Nice work, Mugen.