I think it’s right. The mirror takes f(x,y,z,t) and maps it to f(x,y,z-t), thus reversing it in the time dimension but not space. It doesn’t make it go backward

I think it’s right. The mirror takes f(x,y,z,t) and maps it to f(x,y,z-t), thus reversing it in the time dimension but not space. It doesn’t make it go backwards through time, it just reverses lights behavior with respect to time.