The Los Angeles Lakers gathered around Anthony Davis while the six-time All-Star writhed in pain on the Staples Center floor. Another breezy blowout win had just become much less fun for the Lakers and their superstar big man, although it's too soon to say just how serious it will be for their championship dreams. Davis left in the third quarter after bruising his lower back on a painful fall during the Lakers' sixth straight victory, 117-87 over the New York Knicks on Tuesday night.