fear of coordination of both feet combined with cranks that keep moving
do this off bike exercise:
stand up, now hop forward about 6 inches using just your ankles with both feet side by side
now do it with one foot a bit in front of the other like the cranks will place them on the bike
then do it one foot at a time, cause you can do it off either foot or both feet, both ways will get your weight off the bike and moving upward bringing the bike with you
get on bike and do the same thing, its a jedi mind screw, thats all it is, you can hop on and off a pedal while it is going around, weird at first, but thats all it is
to do a quick skip skid, I put my dominant foot forward and hop off of it then pull up with it and put my weight on the rear pedal at the same time, its a one-two motion, that split second while your weightless in the air is when you switch to pulling up on front pedal and pushing down on the rear one
if your having issues then try switching which foot is in front, sometimes that helps