Yes, yes, and let's not forget the suits were inflated, further hampering movement.
Regardless, stiff or not, leaping forward should have made a grasshopper jealous. Slow on descent is one thing, but acceleration would have been, well, accelarated due to less gravity restraining them.
The jolt forward would have happened once they got going forward. And losing balance should have been easy. Yet no one is teetering forward a wee but too much till the stuit stopped them, etc.
If you threw a rock on the moon, it's not going to fly slowly from the get go. And you would probably send yourself falling after throwing it.
Plus, sure they trained underwater and on planes looping around to mimic the loss of gravity, but that would not have accustomed the vestibuler system to the altered cues from the moon's lesser gravity. That the astronauts didn't look like tightrope walkers trying to balance themselves but forward-wise as opposed to laterally while puking their guts out is practically more amazing than just getting there. Must have megadosed on the Dramamine.