  Recently, a new assumption was proposed in [Phys. Rev. D 100, no.10, 104022
(2019)]. This assumption considers that the energy of the particle changes the
enthalpy of the black hole after throwing the particle into the black hole.
Using the energy-momentum relation, the results show that the second law of
thermodynamics of black holes is valid in extended phase space. In this paper,
we discuss the validity of the laws of thermodynamics of the black hole and the
stability of the horizon by scalar field scattering under two assumptions,
i.e., the energy flux of the scalar field $dE$ changes the internal energy of
the black hole $dU$ and the energy flux of the scalar field $dE$ changes the
enthalpy of the black hole $dM$.
