  We investigate the thermodynamics and stability of the horizons in warped
anti-de Sitter black holes of the new massive gravity under the scattering of a
massive scalar field. Under scattering, conserved quantities can be transferred
from the scalar field to the black hole, which change the state of the black
hole. We determine that the changes in the black hole are well coincident with
the laws of thermodynamics. In particular, the Hawking temperature of the black
hole cannot be zero in the process as per the third law of thermodynamics.
Furthermore, the black hole cannot be overspun beyond the extremal condition
under the scattering of any mode of the scalar field.
