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'.
(..) We? Yes. Bolt, I can be a valuable addition to your team. - I'm listening. - I'm lightning quick. I have razor sharp reflexes and I'm a master of stealth. Plus, I'll keep the cat in check. - The road would be rough. - I have a ball. - There is no turning back. (..)2008 Bolt