Related Clues

• Don't just stand there
• Slam on the brakes, e.g.
• Do something
• Take countermeasures
• Do a double take, e.g.
• Push back, perhaps
• Change chemically
• Flinch, say
• Strike back
• Respond to a stimulus
• Make a move
• Jump at a noise, e.g.
• Strike back, say
• Strike back, e.g.
• Change, chemically
• Do a double-take
• Flinch or blink, say
• Not just sit there
• Not keep a poker face
• Flinch, e.g.