Mr Williams had suffered severe head and face injuries and multiple rib fractures in a "brutal, vicious and sustained attack" with a heavy object, police said.
Aubry was treated at Cedars-Sinai Medical Center for a fractured rib and several bruises on his face and forehead, and he required stitches to repair three cuts in his mouth, the filing said.
Sale fly-half Charlie Hodgson left the pitch in the first half after suffering a bang to his face but it is not thought to be serious, while Newcastle prop Jon Golding sustained a rib injury.