So what ya saying is that is should be moving at light speed since it's repelled at light speed?? However that's not true, a sw is a disturbance in the air or an after effect of an already done pressure, while a shockwave happens it changes the airs pressure density and mass
Yeah because every action have an equal and opposite reaction he moves his hand at light speed that's is an action creation of shockwave due to that is a reaction which means it's also moving at light speed consistent as in literal same arc zoro dodged his light beam