to shrug one's shoulders

to be petrified; to be unable to move; to be paralyzed (with horror); to be stupefied (with amazement)

to freeze (from fear, etc.); to be unable to move (e.g. from surprise); to be paralyzed (with horror, etc.)

to cower; to shrink in on oneself

to duck one's head; to pull in one's head; to duck down; to shrug one's shoulders

to shrug (shoulders); to duck (head); to draw back (body)

to hug tight; to grasp firmly; to embrace tightly

to freeze (from fear); to be unable to (too frightened to) run

to pin the enemy down; to glare another down (and render impotent)

to cringe with fear; to cower with fright; to be terribly afraid

From the snake fearing the slug, the slug the frog, and the frog the snake

three-way deadlock