  We investigate the entanglement entropy and the information flow of
two-dimensional moving mirrors. Here we point out that various mirror
trajectories can help to mimic different candidate resolutions to the
information loss paradox following the semi-classical quantum field theory: (i)
a suddenly stopping mirror corresponds to the assertion that all information is
attached to the last burst, (ii) a slowly stopping mirror corresponds to the
assertion that thermal Hawking radiation carries information, and (iii) a long
propagating mirror corresponds to the remnant scenario. Based on such analogy,
we find that the last burst of a black hole cannot contain enough information,
while slowly emitting radiation can restore unitarity. For all cases, there is
an apparent inconsistency between the picture based on quantum entanglements
and that based on the semi-classical quantum field theory. Based on the quantum
entanglement theory, a stopping mirror will generate a firewall-like violent
emission which is in conflict with notions based on the semi-classical quantum
field theory.
