I'm not a director, but I know what fear looks like... Most people, when they are scared to death, are indeed feeling helpless. They throw up their arms in an instinctive pleading posture to the threat. When adrenaline gives a full dump, the knees buckle, the eyes and face give a pleading-for-mercy look, unless they turn it into aggression, then rage comes full throttle. Also, when real fear hits, there is a freeze. Anyone ever have a gun pulled on 'em or been threatened? Then there's an instant freeze if you don't know how to control fear. I'm not sure how you would show that to a viewer, but I could think of some ideas... Go to geoffthompson.com and read an excerpt from his book Red Mist... He's a martial artist and he knows fear. The way he describes it is dead on and a good guideline on how to maybe show it... Just my two cents...
Rob