Now I, John
This is one of five places in the book of Revelation where John refers to himself by name (Rev. Rev. 1:1+, Rev. 1:4+, Rev. 1:9+; Rev. 21:2+; Rev. 22:8+). In every case, he merely gives his first name and assumes his readership will know which John is meant. This is evidence of authorship by John the Apostle. See Authorship.
I fell down to worship before the feet of the angel
This is the second time that John has been overcome by the magnitude of the scene and the revelation provided by the Angel. No believer, not even one of great spiritual stature as John, is beyond the subtle temptation to worship what is good itself in place of God who alone is to be worshiped.1 See commentary on Revelation 19:10.