What is the meaning of the phrase, “the protocol has become rusty” from page

In the following conversation, which group discussion technique does emily most clearly show?

Which words from the excerpt most contribute to the patriotic tone

Which literary device does orwell most use to support his purpose in writing in this passage? characters, to show that what happens on the farm is fiction allegory, to show similarities between the farm and the soviet union point of view, to show how the characters think about the murders setting, to show that events in the soviet union may have been caused by the economy