Exorcism was known in the ancient Jewish world, but Mark emphasizes the unusual directness of Jesus' command. The crowd compares his authority favorably with ordinary teachers.
Mark also develops an irony in which demons perceive aspects of Jesus' identity before many human characters do.
The Old Testament reserves ultimate sovereignty over hostile spiritual powers to God. 'Holy One' language is frequently associated with God, although the precise title 'Holy One of God' need not itself mean that Jesus is God.
The demon asks whether Jesus has come to destroy the unclean spirits and identifies him as the Holy One of God. Jesus neither accepts testimony from the demon as a teaching platform nor debates it; he commands silence and departure.
The spirit obeys, and the crowd asks what this new authoritative teaching means.
Neither exorcism nor the title alone proves deity, so this record remains Supporting.
Its value lies in Mark's cumulative pattern: Jesus possesses intrinsic authority over the spiritual realm, and supernatural opponents recognize an identity that human observers are still struggling to understand.
The unclean spirit identifies Jesus; the crowd is amazed that even unclean spirits obey him.