Chasing the news is not a good stock-picking strategy for the individual investor. Soon, traders may decide that Tata Motor's price has fallen lower than its fair price... They will buy it, driving the share price up.
This is one reason why so-called conservative stock pickers prefer a buy-and-hold strategy. They can ignore the hour-to-hour noise, confident that a good company's stock will, over the long run, go up.