Buck finally gives up and learns an important lesson, which serves as an "introduction to the reign of primitive law.". In order to survive in the wild, the mightiest, most aggressive being reigns supreme and should not be challenged.
The answer would be "Et tu, Brute?". This famous line translates to "Even you, Brutus?", which displays Caesar's shock and surprise that Brutus was part of the conspiracy. <span />
