This announcement is shocking because:
* He is defying the norm: Typically, the eldest child is chosen as tribute, but Peeta volunteers to protect his sister.
* He is defying his father: His father, known for his harshness, expects Peeta to "man up" and accept the reaping.
* He is risking his life: Peeta knows the dangers of the Games and is willingly sacrificing himself.
This decision further highlights Peeta's compassionate nature and his deep love for his family. It also creates a powerful dynamic within the story, as Katniss now has a deeper connection to this boy who is willing to sacrifice everything for his loved ones.