The updrafts over the flames around the Sorrow’s Eclipse are too short. Depending on the character it is impossible to even get into the ley-line stream at all.
For example, with my male charr I have no problem whatsoever, but with my male Norn I can hardly find an updraft that lets me fly high enough to get dragged along with the ley-line for a couple of meters. Most updrafts do not let me touch the ley-line at all.