The frantic scramble ended 24 yards shy when a fourth-and-16 Clive Walford catch covered just 11.
Miami lost to North Carolina 18-14, but the uncertain quarterback picture looms larger. Morris, who set ACC and UM records two weeks ago, was expected to have X-rays Saturday night and coach Al Golden didn't immediately know about Morris' future.
The injury looked ugly from the beginning. Scrambling toward the Miami sideline, Morris threw across his body with 8:26 left. Instead of his foot, Morris' left ankle dug into the Sun Life Stadium turf. Trainers sprinted to his side as Williams grabbed his helmet.
Walk-ons surrounded Morris as he sat on a trainer's table before hobbling off. He ducked into the old Marlins' dugout just as the Tar Heels punted to set up the last of many Hurricane scoring opportunities.
Miami's embattled defense held the high-scoring Tar Heels to 18 and it was the offense's turn again. Nibbling for short gains to start, Williams converted a fourth-and-three with a four-yard pass to Mike James.