User blog comment:NOS Sterling/Sonic Movie has been Comfirmed/@comment-24026943-20140702194852/@comment-32856285-20140906004253

He doesn't tell the writer to put explosives in the movie, he tells the SFX supervisor to add in the explosives.

The writer is the one who comes up with the idea, the director is the one who gives it life. It a similar relationship between a writer and an artist when making comics.