Tesla has gone on record as saying that the incident, which didn't injure the driver, was more or less a freak accident of "doomsday" proportions. Tesla chief Elon Musk said the piece of metal in question had to have been kicked up at a force equal to 25 tons in order to put the three-inch-diameter hole in the metal plate running along the bottom of the sedan. Musk said on the company blog earlier this month that gas-powered cars are five times more likely to catch fire than the Tesla, metal debris be damned.
Tesla shares are down about 15 percent since September 30, the day before the car fire. That's about $365 million worth of market value that's gone up in smoke. You can see a video of the fire here.