Sued for what? Let's assume the original photog who hired the OP is less than honorable:
As I've already pointed out, he could have easily copied the cards onto his computer with the intent of never paying the OP. Since there's no contract, there is no proof how much he was supposed to pay the OP or if he was even supposed to pay him at all. He could now claim the OP agreed to shoot the wedding for free just to get the experience of shooting weddings. His word against the OP. If their only contact was verbal (no email, text messages, etc.) there's no proof either way.
I should have clarified, I have every e-mail saved with my dialogue with the Tog, including the agreed payment and my admission that I wasn't experienced.