He 'walks a/the razor edge' [='walks a/the fine line'] between humor and bad taste in his comedy.
It was a 'razor-thin' victory. [=a victory that was won by a very small margin or amount]
He's a thrill-seeker who likes living 'on the razor's edge'.
(..) - Look around. The city has come back to life. - You made a pact with fanatics. - I did and it worked. If you shaved your beard with a straight razor, you'd say the razor worked. That doesn't mean it won't cut your throat. Spoken like a man who has never had to shave. I'm going to miss you. (..)2016 TvShow: Game of Thrones Title: No One Season: 6 Episode 8