Sorry for waiting so long. i was reluctant to say anything at all, because it really shook me up. i haven't been the same since. what i saw were 2 military jets (not sure of the model), january 10, 2019, 1:35 pm, hartsville, sc, in the backyard of a house on peachtree st., flying from the left side of the photos to the right in the southern sky, i saw some sort of vortex form just a few feet ahead of the jets. from my point of view, the vortex appeared to be white in color and slightly concave, like a parenthese - ) . the vortex maintained a uniform distance in front of the jets for a few seconds. i reached for my mobile phone to get a photo, and the jets vanished into the vortex. the jets and vortex were completely gone, not a trace. the contrails stopped abruptly, and the very faint sound of the jets' engines ceased. the first photo was taken within 5 seconds of the disappearance. there were lots of jets in the sky on that particular day. there may have been an airshow nearby, not sure though.