Final answer:
The Giver sat silently and ended Jonas's training for the day because Jonas was not following the rules and was experiencing emotions. The Giver wanted to protect Jonas and give him time to process his emotions.
Step-by-step explanation:
The Giver sat silently and ended Jonas's training for the day because he noticed that Jonas was not following the rules and was starting to experience emotions. The Giver wanted to protect Jonas from the overwhelming emotions, so he decided to stop the training for the day. By ending the training, The Giver was able to provide Jonas with time to process his emotions and prevent any negative effects.