2 quick points
two quick points:
1. At 600 feet (if they were @ the usual 750 ft p. min on the glide), they only had less than 48 seconds to recognize and react.
Probably much less, since at the very last bit, they were just falling (stalling), so the rate of descent increased.
2. If the pilots had extended the gear only a very few seconds earlier, the demand for the thrust would have been earlier, and the crash would have occurred abit furthur back from the runway!!!!! So everyone involved was really really really lucky!