An observer on the mirror sees his reflexion in the second mirror.
An outside observer sees 2 moving mirrors and according Lorentz time contraction the light has enough time to reach second mirror and com back to first.

We do everything normal but close to speed of light or Black Hole everything mmoovveess sslloowwllyy for an distant observer, the light (information) moves with c only.

An observer on the Black Hole works normal but the distant stars move strange and crasy fast for him.

Is it correct ?