The 49ers defense was flowing aggressively to its left early in Friday's practice. So Joe Williams cut back the other way.
The rookie running back accelerated down the line of scrimmage, then turned up the field for one of the biggest gains of the morning session.
"I thought he had his best day (Thursday) and then it seemed like today was better than that," Kyle Shanahan said after practice. "So I thought he’s put two good practices in a row."
The 49ers spent a fourth-round pick on Williams in April because he had the two traits -- cutting ability and speed -- Shanahan and running backs coach Bobby Turner seek in a runner.