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As far as I am aware, protons only flow in one direction, outside to inside. The key to how the flagellar motor rotates in both directions may lie in the flexibility of FliG.

A higher dimensional space always intersects a lower dimensional space in the lower dimension. For example. A two dimensional plane intersects a one dimensional space in a line ( one dimensional ). A three dimensional space intersects a two dimensional space in an area. ( take a 3D pencil and punch it through a 2D sheet of paper, the intersection is a circular area; easiest to visualize ) Similarly, if we are 4D in extent, then we intersect the 3D 'now' in a volume. It is this volume that you consider our 'selves' ( not the points on your 2D graph and videos ), but actually we extend in the time dimension along a world line. Why would you vacate a previous time co-ordinate; you were 'there' ( then ? ), and we both remember it. And we also occupy future positions along the world line, according to the Block Universe. Our 'now' cross section just hasn't gotten 'there' ( then ? ) yet. I really can't explain it any better than that

No medium in space, that's nonsense😴