Hmm, a fight with Tseng...well, you never go into battle with him, that's for sure... Well, you don't meet him that many times. Barret ws shooting at him from his helecopter, but that could hardly be called fighting...you meet him at the lift in Shinra HQ, but you put up no resistance...again at Mythril Mines, but that was just a brief conversation...Him and Scarlet are at Gongaga, but he does not see you...then Cait Sith helps him get the keystone and then he dies at the Temple of the Ancients. I can't see where you fight him!!