How do Unitarians interpret the Great Commission (Matthew 28:16-20)

When Jesus told His disciples to baptize in the name of the Father and of the Son and of the Holy Spirit, I think that those who believe that God is a Trinity of Divine Persons see this as one God and not three distinct beings. How do Unitarians interpret this, if the Person referenced as the Son by Jesus is just Himself (i.e. not divine) and not the Second Person of the Trinity, is that Person interchangeable with other prophets? Why baptize in the name of the Father and anyone else?