Warning: the following article contains spoilers for Jujutsu Kaisen chapter 170 “Tokyo No. 1 Colony, Part 10”, by Gege Akutami, John Werry and Snir Aharon, available in English on Viz Media.
Fushiguro oozed confidence in his ability to take on Reggie at the end of the previous chapter. He basically told Reggie to worry because now he can really fight. Before Takaba Fumihiko appeared, he was facing various enemies on his own, so he was not capable of serious fighting. Now that it’s just Fushiguro and Reggie, the freshman is ready to go all out.
It turns out that Fushiguro’s confidence was wrong. Reggie had been on the sidelines up to that point, allowing his allies to fight Fushiguro and keeping his Cursed Technique a mystery. In other words, Fushiguro had no idea what Reggie was capable of until the two of them started fighting. Reggie finally revealed his Cursed Technique in chapter 170 and it’s quite troublesome.
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Reggie’s cursed technique is called Contract Recreation. It allows you to recreate contracts and manifest objects from them. That includes the receipts you currently carry on your body. The way it worked was interesting because items aren’t the only things you could manifest from contracts. He proved this to Fushiguro using a receipt for a three-day, two-night stay at a five-star inn, with an oil treatment. Suddenly he was cleansed, healed and rested as if he had actually relaxed for two days in a hot spring.
The things Reggie recreates with his contracts act like shikigami. In other words, he can order inanimate objects to do whatever he wants. This is a problem for Fushiguro and he quickly realized it. Reggie’s body is covered in receipts, so he likely has more that he can use to heal himself. Fushiguro was by now so exhausted from all the fighting he has fought that he is unable to summon his Divine Dog shikigami. Reggie lets him know that he is aware of it, so Fushiguro has no choice but to flee.
Fushiguro ran, but Reggie had no trouble keeping up with him or knowing where he was going. He simply used his technique to conjure a scooter and some drones. Reggie wondered if Fushiguro was simply running or luring him when he reached his location. It turned out that he was, in fact, luring him into a gym. Reggie considered forcing him out with fire, but chose not to because he preferred not to chase after him again.
Reggie entered the gym and mercilessly beat Fushiguro by summoning multiple different objects, including whole trucks and knives. Fushiguro was so busy trying (and failing in most cases) to avoid these attacks from the conjured objects that it was even more difficult for him to think about avoiding Reggie’s own physical attacks. When it looks like Fushiguro is done, he does what drew Reggie to the gym. He used his Domain Expansion, Chimera Shadow Garden.
Reggie is surprised by this as he had no idea that this teenager was a wizard of this level. He guessed that Fushiguro didn’t have great movements and his decision not to force him out of the gym with fire could prove a fatal mistake. However, Fushiguro’s Domain is still incomplete as he has not perfected his technique. That’s why you drew him to the gym in the first place. Reggie may be able to overcome this in some way, in which case Fushiguro would be defeated as using his Domain Expansion at this point will likely deplete his last energy.