Huh, somehow I always though the first stage would orbit the earth once and then land. I never considered that it doesn't have enought speed or fuel to do so even if forced.
The engineering of the Saturn V just continues to amaze me!
"The engine shutdown was determined to be caused by severe pogo oscillations measured at a strength of 68 g and a frequency of 16 hertz, flexing the thrust frame by 3 inches (76 mm)."
It was this close to ripping the whole rocket apart, but it managed to withstand some incredible shaking until the engine shut down.
One of my friends in Houston was dealing with pogo in rockets specifically. So yes, I am familiar with pogo in general, and I had heard of it during the Apollo program.