Wall Street acted like judges at a beauty pageant during Fed Chair Janet Yellen's debut, one market professional told CNBC on Thursday.

As Yellen hinted Wednesday at raising benchmark interest rates sooner than expected—during the first half of 2015—the stock market answered with a 114-point drop in the Dow Jones Industrial Average. Westwood Capital Managing Director Len Blum chalked up the market's skittish reaction to traders anticipating other traders.