Having been spurned by the Prince in the garden, the Queen throws her mirror after him. The rotating mirror casts a magic light beam across half of the petrified dwarf Sunday, restoring that portion of his body to normal, and he totters off...

Now hit the REWIND button.

When the Queen steps onto the garden path, just before she throws her mirror...

Sunday's petrified form is BEHIND her!

The mirror would not have cast any light on him, especially before reaching the Prince, unless Sunday was in front of the Queen.

I can only presume that, even as a statue, Sunday is pretty nimble on his feet!