draw a bead on vs strafe

draw a bead on

verb
  • To aim a gun at. 

strafe

verb
  • To rake (a target) with rapid or automatic gunfire. 

  • To attack (ground targets) with automatic gunfire from a low-flying aircraft. 

  • To sidestep; to move sideways without turning (a core mechanic of most first-person shooters). 

noun
  • A sideways movement without turning. 

  • An attack of machine-gun or cannon fire from a low-flying aircraft. 

How often have the words draw a bead on and strafe occurred in a corpus of books? (source: Google Ngram Viewer )