  The unitary moving mirror model is one of the best quantum systems for
checking the reasoning of the original firewall paradox of AMPS in quantum
black holes. Though the late-time part of radiations emitted from the mirror is
fully entangled with the early-part, no firewall exists with a deadly, huge
average energy flux in this model. This is because high-energy entanglement
structure of the discretized systems in almost maximally entangled states is
modified so as to yield the correct description of low-energy effective field
theory. Furthermore, the strong subadditivity paradox of firewalls is resolved
using non-locality of general one-particle states and zero-point fluctuation
entanglement. Due to the Reeh-Schlieder theorem in quantum field theory,
another firewall paradox is inevitably raised with quantum remote measurements
in the model. We resolve this paradox from the viewpoint of the energy cost of
measurements. No firewall appears, as long as the energy for the measurement is
much smaller than the ultraviolet cutoff scale.
