The "auction" algorithm
The yellow group of rods goes down and then one of the overloading rods catches another lower rod and stays behind. In fact, this gives rise to another "overloaded" group, which is marked in green. The downward motion of the former overloaded rod (the yellow one) continues until it is about to lose its only contact and become underloaded. This is done to separate the former overloaded rod as far as possible from other lower rods, so that it does not obstruct the subsequent stages of load redistribution.
If you were unable to follow the formation of the new overloaded group, press the "Reload" or "Refresh" button of your browser.
In the next slide, the same process is repeated for the new overloaded group marked in green.