Final answer:
The referee should award a goal to the opposing team when the keeper touches the ball but fails to stop it from entering the goal.
Step-by-step explanation:
The referee should award a goal to the opposing team. In soccer, if a player intentionally passes the ball back to their own goalkeeper using their feet, the goalkeeper cannot use their hands to pick up the ball. If the ball is played deliberately by a teammate with their feet and reaches the goalkeeper's hands without the opposing team touching the ball, the goalkeeper is not allowed to catch it. In this situation, since the ball was not intentionally played back by the keeper's teammate, the goalkeeper is considered to have made a save by touching the ball but failing to prevent it from entering the goal.