contrast snowball and boxer's reaction to almost killing a human. What does this tell us about their natures?

Snowball and Boxer are fictional animal characters from George Orwell's "Animal Farm".

After the animals took over the farm, Mr. Jones, the previous human owner of the farm, with other farmers decides to attempt to take back control of the farm.

During the big battle, Boxer, a farm horse, unintentionally stunned a boy. After the battle, convinced that the boy is dead, Boxer is deeply shocked and feels guilty and sorry, while on the other hand, Snowball, a farm pig, shows no regret and mercy, confronting Boxer with words "War is war. The only good human being is a dead one."

Both, Boxer and Snowball, truly believed in Animalism (an ideology proclaimed by farm animals). However, simple-minded Boxer, believed that no ideology is worth taking someone's life, even an enemy's, while on the other hand, Snowball sees the revolution and Animalism as the greatest ideal and value; death, either of an animal or a human, is just a normal consequence of the revolution, and is the price that needs to be paid