1 user here
Vertical scrolling in Multi-column (Serpentine).
Yec'th
Down Up-Down Up-Down Up-Down
(Smooth) Horizontal scrolling is probably for eyes tracking text.
A full screenfull jump/flip (skip the page turn animation please) allows the eyes to quickly locate the new starting point and continue reading (do not overlap by single a line, either please. It fits on this page or it is on the next one, not both).