The audience has a smiling man in glasses who seems to know Zushi. The man has something off about him, but it is hard to tell what given that he isn't doing anything besides watching and occasionally gesturing at Zushi. Zushi goes to talk to him, but Warden gets called to beat up some looser in a gi before he can follow up.

He is not as ridiculously overpowered as he expected to be. That's a sting to his pride, but on the other hand, one does not walk the Path by never being challenged. And strength such as this is a good sign for future advancement. There's a hidden world here, of sorts.

He actually tries, for this fight. Technique to back up his strength and durability - He accepts incoming blows in order to land a disabling punch of his own.

Hopefully not disabling enough to permanently hurt this guy. He's too used to fighting people who recover quickly.

He's not fighting at nearly his hardest, though. Maybe if he utterly dominates, he'll move up faster, but there's no need to rush when he's planning to use the prize money to clean up a bit, and investigate things.

This is great attitude and more or less correct for the nature of this world. Well the hidden power part. The part about moving up faster depending on your margin of victory is only true one floor one, which he'd know if he did even basic research instead of being illiterate and from a world were Heaven's Arena broadcasts aren't staple of sports television programing.  Gi guy is not part of the hidden world and goes down like a sack of potatoes. Warden now has a floor 50 ticket.

He asks the tournament staff for some clarification on how this all works. Can he leave now and come back tomorrow for more fights? How does the pay per fight rise compared to the floor level? What happens if he loses, is he out for good or what?

She seem mildly confused that he doesn't already know this, but not enough to make an issue of it.
In order, yes you can have up to 90 days between fights with no penalty then start running into sanctions for longer breaks. The pay goes up rapidly per floor up till floor 200. A win gets 50,000 J on floor 50, 1,000,000J on 100 and 200,000,000J on 190. Also in tower accommodations are provided for fighters at floor 100+. If he loses he goes down 10 floors. He gets kicked out at the point this would put him bellow ground.  A lot of this changes on floors 200+ but he doesn't need to know more while he's still on 50 (its implied thinking otherwise is arrogant).

Good enough for now! Good enough to go get new clothes and properly wash his sect robes, then sleep in a motel instead of the park and pay a random university student at the library to tutor him for a couple of hours (he's quite quick, and doesn't explain why he's illiterate, and is paying extra for no questions- This ends up being the bulk of what he uses his 40,000 absurdly-small-denomination money for), and then he can stay up all night practicing reading.

And then he goes to floor 50 the next day and wants to fight someone.

This is really stretching 40,000J but a mix of being intimidating to the poor student and thrift stores can make it work. Luckily the written language is extremely straight forward. The script is completely phonetic with limited punctuation and hasn't even had time to go through any serious vowel shits or other changes since it was standardized so he basically just needs to memorize the characters.

His opponent is one of the little kids though he does seem to be the weakest of the three.

"Something's special about you, isn't it?" He asks before the bell rings.

He begins the fight taking it seriously. Something is off about the group. What's this kid's gimmick going to be? Absurd strength in that tiny frame? Some rudimentary form of anam techniques? His fighting style kind of suffers without allies to take advantage while he occupies attention and absorbs blows, but standing firm and punching back while getting the measure of an opponent is one thing he can certainly do.

Zushi is clearly trying not to react to the statement about him being special, but has the acting skill of a 10 year old that has been studying martial arts instead of theater. He opens up with a barrage of punches that are far too strong, fast, and well coordinated for his age but not that much beyond what a non-cultivator adult could manage if by adult you mean "heavyweight boxing champion".

A good fight! Huzzah. He feels a little bad about fighting seriously against a little kid and is noticeably going easy on him, but that goes away the first time a punch sinks into his gut and actually hurts.

Abyssal Fist Warden's style is built to take advantage of his endurance and strength. Full-body maneuvers (with fists and legs both) that open him up to counter-blows but are accordingly difficult to dodge, motions that should be exhausting repeated over and over without noticeable drain. And none of it is overly flashy and inefficient - While not as graceful or practiced as some fighters, his strikes and dodges have very little wasted motion to them.

The judge calls out two points for both of them. There is of course a scoring system that no one bothered to actually explain to him. Luckily sports announcers like stating the obvious and will remind everyone that if either fighter gets to 10 points in absence of a K.O. or similar they win.

He is now taking this fight seriously and wondering how the hell a little kid is this powerful without anam, how does his cultivation work- Feinted leg sweep into straight-arm punch, obvious feint that's actually not a feint at all, push the kid back and space him out by sheer size and willingness to take hits-

Zushi is clearly frustrated, but more like someone being force to hold back then someone actually outmatched.
After being pushed back he willing cedes space to make distance, and takes a hyper grounded stance. He begins to emit something that is very much not anam but is closer than anything else Warden has seen in this world. This is accompanied by a mental pressure that is probably intended as an attack in and of itself.

He is watching very closely. What the hell is this, how does it work- Punch off sheer inertia and combat instincts even as he's mostly paying attention to the not-anam-

The punch gets him another point from the slightly oblivious referee.

In the audience directly behind Warden two newly arrived spectators get an indirect hit from Zushi's attack. This immediately starts a whispered conversion between them.

From the opposite end of the stands, Wing calls out for his student not to use "that".

Zushi will be briefly distracted by his coach before beginning to power down.

Oh, good. The pressure was getting to him a little bit. He smiles a bit with a little nod, trying to say 'no hard feelings' with it.

And: More fighting. That too.

It is close, partially because the scoring system is biased against Warden's counterstriking strategy, but fundamentally this incident really put Zushi in a bad spot. He takes some hits before he gets his head back in the game and with his ranged attack off the table deliberately backing up to the edge of the ring against a taller oppent who was already trying to space him out turns out to pretty crippling.

"Good fight." He bows respectfully. He doesn't seem to be even winded. "I'm sure you'll meet me again soon."

He returns the bow:"Yes, I look forward to earning a rematch when I reach the higher floors"

The two other kids follow Zushi as he goes to talk to Wing. They are stealthy enough to blend into the crowd from perspective of Wing and Zushi, but aren't trying to hide what they are doing from Warden or trying to avoid being tailed themselves.

Wing uses the flawed find a place crowded enough that the crowd isn't listening to each other strategy to secure some privacy for himself and Zushi. At that point he will gently but very firmly remind Zushi that he is not to use "nen" below the 200th floor or for that matter against anyone who isn't either a nen user or trying to actually kill him.