The first bar crossed the tank and connected to a rocker bar, which then connected to the second torsion bar which then came back across the tank the other way and was attached to the hull,
Normally a torsion bar has one end that is free to rotate and one end that is fixed and the bar remains in a rigid line simply turning on a axis, this system is more of a hybrid
I understand the idea and the method of torsion bars, I just don't understand how the suspension in the Panther could work. If it was built as you describe, with a simple bar between the two torsion bars, then the twist of the first bar would lift the free end of the second bar. That isn't something you can do with a torsion bar, it would likely just snap, even if there were space in the underside of the Panther for that sort of movement. If the technical drawings of the Panther are accurate, there isn't room for that kind of movement at all.
The twist from one torsion bar to the other would have to be handled by a small gearbox and not a rocker arm (or bar, because as far as I know, there is no such thing as a rocker bar.) The problem is, I can't seem to find any information or images that support my little theory.