The phrase is a repeat of the words used in Revelation 18:10 to describe where the kings stood; they too distanced themselves from the devastation of fallen Babylon because they did not wish to be associated with her and so potentially share in her plague. Again, this differs from the allegiance that saints have to the Lord Jesus Christ; they stay with him even unto death (Revelation 12:11).
15 The merchants of these wares, who gained wealth from her, will stand far off, in fear of her torment, weeping and mourning aloud,