What were Jonas' felings as he and the Giver watched the horrifying video playback from the release of the twins in The Giver?

This represents a crucial point in the narrative because
this is when Jonas learns the truth about his father, the true meaning of the euphemism
"release" and the inhumanity that characterises his community. Key to note is the way
that during this chapter, chapter nineteen, Jonas at first keeps on expecting a good
ending to what he sees, interrupting the description of the video with his thoughts
about what is to happen next:

Now he
cleans him up and makes him comfy, Jonas said to himself, aware that the Giver didn't
want to talk during the little ceremony.

However, as he
looks at the body of the twin, Jonas remembers another vision he had seen, thanks to the
Giver:

Once
again, as he had on the playing field, he felt the choking sensation. Once again he saw
the face of the light-haired, bloodied soldier as life left his eyes. The memory came
back.

He killed it! My father killed
it! Jonas said to himself, stunned at what he was realising. He continued to
stare at the screen
numbly.

So, at first, Jonas
is completely numb as he realises the truth of what his father had done. When the Giver
tells Jonas about the release of Rosemary, his predecessor, Jonas experiences a real
internal pain and confusion:

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Jonas felt a ripping sensation inside himself,
the feeling of terrible pain clawing its way forward to emerge in a
cry.

Jonas has just had his
entire world turned upside down. Everything that he has believed in has turned out to be
false, and what is more, his father, who he had loved and trusted, is shown to be a
monster. Understandably he feels great pain and hurt.