blame vs draw a line in the sand

blame

verb
  • To assert or consider that someone is the cause of something negative; to place blame, to attribute responsibility (for something negative or for doing something negative). 

  • To censure (someone or something); to criticize. 

  • To assert the cause of some bad event. 

noun
  • Culpability for something negative or undesirable. 

  • A source control feature that can show which user was responsible for a particular portion of the source code. 

  • Censure. 

  • Responsibility for something meriting censure. 

draw a line in the sand

verb
  • To indicate the threshold or level above which something will become unacceptable or will provoke a response; to create a boundary and imply or declare that its crossing will provoke a (negative) response. 

  • To lay down a challenge; to provide a test of commitment (often one which carries a high risk) to a cause. 

  • To create a real or artificial boundary or distinction between (two places, people or things). 

How often have the words blame and draw a line in the sand occurred in a corpus of books? (source: Google Ngram Viewer )