FWIW if you really are caught out in the open the best advice is to stay out of caves and depressions in the ground because lightning will track along wet ground and may go through you on the way. Trees obviously; I've seen an oak tree that was struck and the lightning boiled the sap and blew the bark off leaving a naked tree. If you crouch down on the ground, try to have only your feet actually on the ground as lightning could also track along, up your arms and down your legs. Don't throw away your bike or ice axe, they make no difference.
My sister got struck in a tent in the bottom of a valley in Andorra; the lightning (or a small branch of it) came down one tent pole, jumped through the frame of a camp bed on which her BF's child was lying, through a big tin of Brillo pads, which were fused into one smoking mass, and then into the other tent pole and to Earth.