I can't find any articles that highlight what that component that "flies away" after the landing is going to do next. Does it just get dumped somewhere? Does it go back into orbit?
It started with ~800 lbs of hydrazine fuel on board that had to slow tons moving at 200 mph to a dead stop, and then hover for 10+ seconds while the lander spun down; and then boost away and crash. ("Crash-land" sounds like entirely more control than what really happened.)