Basically, you knocked the support out from under the egg. For a brief nanosecond or so, the egg didn't move because it was already stationary (not moving). But then, as usual, the force of gravity took over and pulled the egg straight down toward the center of the Earth.
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Answer:
Basically, you knocked the support out from under the egg. For a brief nanosecond or so, the egg didn't move because it was already stationary (not moving). But then, as usual, the force of gravity took over and pulled the egg straight down toward the center of the Earth.