Reduce person and mirror image

[ooki]

Hey

Last session I was playing my magus, and I had cast mirror image (so I had like 5 more of me), I then cast reduce person on my self.

The GM then said that I would become small as per the spell, but that
all my mirror images would remain medium. I disagreed.

After some discussion, he decided that for this time the mirror images would become "reduced" alongside with me provided that I asked here for
your guys opinion.

So, do the mirror images become small or do they remain medium?

[Orfamay Quest]

They mirror you. If you change, they change. The spell would be useless otherwise.