This means that John purposely lay on the ground and stretched himself out in reverence or submission. This action was an important part of worship, to show respect and willingness to serve. See how you translated "fell down" in [Revelation 5:8](../05/08.md).
Here holding stands for believing in or announcing. Alternate translation: "who speak the truth about Jesus" (See: [[rc://en/ta/man/translate/figs-metaphor]])
Here "spirit of prophecy" refers to God's Holy Spirit. Alternate translation: "for it is the Spirit of God who gives people the power to speak the truth about Jesus" (See: [[rc://en/ta/man/translate/figs-explicit]])