The Pharisees are rebuking the Sadducees by affirming that spirits and angels do exist and can speak to people. Alternate translation: "Maybe a spirit or an angel has spoken with him." (See: [[rc://en/ta/man/translate/figs-hypo]])
This is a building of military strength and importance, which frequently includes housing for soldiers, or barracks (UDB). See how you translated this in verse [Acts 21:34](../21/34.md).