Effect of magnetic twist on the efficiency of damping by the interplay of magnetic diffusivity and plasma viscosity for an initially twisted tornado. The blue and red curves represent the damping against wave number regarding the fast magnetoacoustic torsional waves when the equilibrium magnetic twist is equal to 0.1 and 0.3, respectively. The solid and dashed curves are for plasma-β conditions equal to 0.1 and 1, respectively.