It still makes an energy barrier, and that is what we need.

The above argument can take another form if the door is modeled as a potential energy barrier.

This is many times more than what was needed to overcome the energy barrier.

Temperature, in the other hand, controls the high of energy barrier.

But the device responsible for the energy barrier was something else again.

It seemed to have come from the other side of the energy barrier.

The guard didn't seem to notice that anything was wrong as he stopped in front of the energy barrier.

I read the report on your mission to the energy barrier.

They both slip back through the energy barrier and return to their own neighborhood.

And no guards, even on the other side of the energy barrier.