Let it go or balk?

[aevans410]

On what grounds would you balk this?

Did the pitcher throw to an unoccupied base? Nope
Did the pitcher use any illegal footwork or do anything illegal with his hands? Not according to your post.

It sounds like they have a kid with a gun in center, and run this play all the time. There's nothing to balk here.

You got it right, good call.