Where do I go once I'm out of the cell?

Hint 1 of 7:

Well, there are guards everywhere around you.

Hint 2 of 7:

Didn't the thing next to you promise to take care of them if you could free
him?

Hint 3 of 7:

Well, go do it.  The security station is the fourth square to the left of
Rex's cell.  It doesn't have a force field on it.

Hint 4 of 7:

Did you notice that monitoring device on the desk?

Hint 5 of 7:

It also gives you a chance to open the force fields on the cells.

Hint 6 of 7:

Try pressing the red button to do the job.