During the beginning of the Civil War, Amadeus tried to get as far as humanly possible away from the conflict, and ultimately ended up stopping in front of a dojo when he straight up found himself running out of gas in Phoenix Heights. He sure as fuck wasn't going to try and get gas in that chaos. There were a few people in there, students and teachers, anyone who didn't feel like they could go home in the midst of all hell breaking loose.
Eventually things got so bad that they finally locked the door and hid in the basement. He got to know the people a bit, but after a few days, they ran out of what little food they had any access to. So, Amadeus, with his ability, agreed to go out and get food. With the local cats, he could scout a clear path for himself to scavenge.
They didn't have much to offer him in return, so to pass the time, they started teaching him martial arts. He wasn't the most disciplined person in the universe, but there wasn't a hell of a lot else better to do, so he stuck with it, took it seriously. But occasionally they'd have to hide in the basement, the dojo got raided once in a while during the war, but Amadeus used the cats as a sort of warning system, so that they could hide themselves away when needed.
After the war, things were still a bit of a mess, but local crime started to get back on track a bit. Things changed a lot when Wenzhuo Zhao returned to the neighborhood. There may have been a war, but there were still debts. Normally some grunts would get sent, but something piqued Zhao's interest. He stepped into the dojo himself, and immediately assaulted Amadeus' mind. They were both telepaths of a similar variety: The feline variety.
This would be the first time Zhao would fight Amadeus. While the much younger telepath had been practicing martial arts for a year, he was nothing like Zhao, Amadeus only had the foundation of the art down. And his masters, they didn't dare raise a hand against someone like Zhao. He warned, he'd return and raise the debt for each defeat of Amadeus. Why? He didn't make himself particularly clear on that.
Amadeus tried to leave, but Zhao just beat him and raised the debt anyway.
Not seeing any other choice, his masters started training him very seriously. Amadeus started taking things much more seriously as well. He didn't want this to fall on his masters or the young students, all people who welcomed him. Somehow he didn't feel the urge to be a piece of shit and just try to leave, plus, well, Zhao seemed to have a thing where he could just find Amadeus wherever the hell he went.
Zhao showed up roughly every six months. The fights became increasingly competitive, and at the end Zhao would always make a point to assault Amadeus' mind.
By the time around five years passed, Amadeus was settling into doing some petty crime again, though he still remained dedicated to martial arts. He still prepared for Zhao's semi-annual arrival. By this point, Amadeus could call himself a master of Jeet Kune Do, even taking on many of the philosophical teachings, and reading a little, unlike in his younger days. By this time, he started to consider how the hell he'd pay the debt back, that was now astronomically high.
Even if he could beat Zhao, it wouldn't magically make the debt paid off. But still, he started getting involved in underground cage fights, something that wasn't exactly hard to find even before the Civil War. With his training, he was pretty damned good at kicking people's shit in. He at least managed to sort of put a small dent in the debt, but it still wasn't enough.
Present day, 2018, Amadeus is still with the dojo, there's still a debt, but now he's trying to become a legitimate martial artist. He's training to try and get involved in official amateur fights, with the intent to try and go pro, but only time will tell with that. He has a surprising amount of talent for it, but with Zhao and his ridiculously aggressive motives, possibly trying to force Amadeus to feel no choice but to join him as a debt slave, who knows where the young Deckard will end up.