Rebellion essentially prevented all villagers of everyone to be controllable for two minutes, playing a unique animation thrusting their arms up with whatever object they last used (Based on the attachpoint) along with preventing the training of further villagers.
"This second age god power causes villagers, laborers and gatherers everywhere throw down axes, hoes and picks to rebel against their back-breaking toil. Training stops, resource gathering stops, your economy will grind to a halt while the rebellion rages.
To incite Rebellion left click on the Rebellion god power at the top of the screen and left click anywhere on the map. Rebellion affects every player, so make sure you are ready for the break in training and resource gathering."—- Multiplayer Alpha, help section