I also saw all the walking people, but I chose to try it on my own, here is what I did:
mummy.leftleg turn backward .05 revolutions
do together
mummy move forward .5 meters
mummy.leftleg turn forward .1 revolutions
mummy.rightleg turn backward .02 revolutions
do together
mummy move forward .25 meters
mummy.rightleg turn .02 revolutions
mummy.leftleg turn backward .05 revolutions
That made one full step from left leg to right.
I did this way so that I could do it without the automated step, and so that I could make the mummy look more natural, cause they don't move at regular speed, and they don't walk the same on both legs.