How Low Could Expedia Stock Go If A Real Shock Follows This Slide?

Expedia (EXPE) stock fell 7.7% on September 23, leaving it about 24% below its August 24 high of $339. Yet the company's latest results beat its forecast, and over the past 12 months the stock has still returned about 17%, roughly in line with the S&P 500. So how far could Expedia go in a real market shock.