Yes, when Xl and Xc equal zero lets say, current is at it's max, you will never get L1 or L2 to choke off all the current from rushing back, and that causes an oscillation between the two chokes. what's between the two chokes the water capacitor. It want be a huge amount of current because be don't have a huge amount of current in the secondary side anyway. But we do have a huge amount of voltage at this time. Just calculate the time constants of the L1 Charging and the time constant of it's decay time. You better have a pulse coming in at the right time when the decay time starts to takes place or you will have current movement. I personally believe you will never get it to choke it all and stop all movement. That's where the term voltage stimulation comes from Stan talks about if you ask me! That little bit of current change is enough to allow the voltage to raise and lower a real small amount in the cell. (Voltage Stimulation)
If you reach this point, Just remember this old saying:
Mary had a steamboat the steamboat had a bell, Mary pulled the wrong chain and the steamboat blew all to H@$L.
So the moral of this story is, don't turn the wrong knob, or pull the wrong chain when you reach this level of resonance. LOL