"I don't usually experience that because there are few people who intimidate me, but Woody was one of them"

This quote by Treat Williams recommends that he is not easily daunted by individuals. He suggests that he is positive in himself and his capabilities, which it takes a special sort of person to make him feel daunted. In this case, the person who frightened him was Woody. It is likely that Woody had a certain existence or aura that made Treat Williams feel frightened. It could be that Woody was an effective figure in the market, or that he had a certain level of competence that made Treat Williams feel inferior. Whatever the case may be, it is clear that Woody had a strong effect on Treat Williams and was able to make him feel frightened.