The TS system works like any conventional ignition system (read ford fiesta!!!), and uses a technique called "wasted spark".
If you closely examine the way that the coil packs are installed, you will see that the coil pack on cyls 1 and 2 fire directly onto the main plug, and on cyls 3 and 4 the coil packs sit directly onto the smaller "side" plug.
Thus the system is wired so that the coil on cyl 1 fires the main plugs on both cyl 1 and 4, the coil on on cyl 2 will fire main plugs 2 and 3, coil pack 3 fires side plug 2 and 3 and coil 4 fires side plug 1 and 4.
The side plug is not located in the centre of the cylinder, but towards one side in the "squish" are of the cylinder, and as far as I can tell, this plug fires at the exact same time as the main plug. This should (theoretically) generate a more even burn in the cylinder.
Obviously, because of the way the system is wired up, if you fire main plug one, you also fire main plug 4 etc etc, thus the rumor of firing on a stroke that is not under compression - this is happening - and is generating the "wasted" aspect of the spark.
So where does this tie up with a lowly ford fiesta...
Well, these use a single coil pack, that is split in half, and is wired so that on half fire cyls 1 and 4 and the other cyls 2 and 3 - not disimilar to the ts system - just one less set of plugs, and it is all done from a single coil!!
Hope this clears up the myth!!