In this parable, Jotham describes the thornbush and the trees as doing things that humans do. (See: [[rc://en/ta/man/translate/figs-parables]] and [[rc://en/ta/man/translate/figs-personification]])
To anoint someone with oil is a symbolic action that appoints a person to be king. AT: "to appoint me as your king" (See: [[rc://en/ta/man/translate/translate-symaction]])
The thornbush refers to itself as "the thornbush." AT: "then may fire come out from me, the thornbush" (See: [[rc://en/ta/man/translate/figs-123person]])