I fell at his feet as dead; literally, as one dead—as a dead man. St. Peter had fallen at Jesus' feet when he became conscious of the ineffable difference between sinlessness and sinfulness (Luke 5:8).
How much more, therefore, would consciousness of the glorified Christ overwhelm St. John! Long years of contemplation of the incarnate Son would not prevent that. In like manner, Joshua (Joshua 5:14), Daniel (Daniel 7:17, Daniel 7:27), and St.
Paul (Acts 9:4) are affected by the Divine presence. Fear not. Thus Christ encouraged the terrified apostles on the lake (John 6:20) and at the Transfiguration. So also the angel cheered Daniel (Daniel 10:12), Zacharias (Luke 1:13), Mary (Luke 1:30), the shepherds (Luke 2:10), and the women at the sepulchre (Matthew 28:5).