Gojo was never the one to leave things on luck so he kept looking intently at that person to see if he was wearing any kind of fake face mask but he found there were no irregularities with the face of that person like a fake face should have. Even the most famous person in use this face makeup technique and blending spy technique have their weaknesses which can help in differentiating it from the original face.
The secret black market was not small to begin and there are some people now and then with face masks who hide their identity. It is the norm among people to hide their identity in such shady places because just one face mask can save them a lot of future problems.
Gojo has the impression of their height and can shorten his search by considering the height and size of people.
In the meantime, Arc and Rimuru were constantly having little arguments but Arc finally gave in on his efforts of trying to argue with him. But Arc knew that hearing the nonsensical blabber wouldn't be useless to him apart from giving him some headache and boring him to sleep at last. So, he provoked the Rimuru to show him the basic skills and Rimuru getting over arrogant said that he could teach him the basic skills of boomerang as a weapon in a very short period.
This whole conversation led to their present situation where Rimuru was trying to explain the principles of his basic boomerang by showing some handwork skills that made the hands fast and flexible a little.
Arc was not getting a hint of even a word that he was saying but as Rimuru was explaining in all seriousness he kept nodding like a good student or in actual a backbencher who does not want to ask questions because he does not wanna hear the same boring stuff getting repeated because either way he is not going to learn anything.
After Rimuru kept explaining for nearly one hour, he was done with his explanation of things and said, "Now you try this boomerang and try to spin in your hand like a knife or student doing pen flipping in their hand while wasting time. Try to do it as I have shown you and try using the little handwork in it which will make it more smooth and appear easier in the long term as you practice it. But, be careful as this boomerang is quite sharp."
Rimuru moved his hand showing a boomerang he was practicing with before to give a demonstration and explanation.
Arc looked at his own hands and then at the blade of that boomrang in Rimuru's hand which was shining with a metallic luster. Now in his eyes, this boomrang has turned into the appearance of the death reaper's blade which is evident in taking the blood from his hand.
"Do you have any blunt boomerang on which I can practice?" Arc asked with a worried face.
"What are you 5 years old? You are on a planet full of monsters where blunt weapons are like toys. Are you being serious at all about asking me that question? Why don't you go play with plastic boomerang along with some pet dog playing catch." Rimuru replied with a little anger as he did not even know how to take this hilarious comment from Arc as seriously. As he has explained the method that can help him learn to avoid injuries.
"Just take this boomerang and show me what I have explained to you." Rimuru didn't give Arc any time to make any comment which might irritate him even more. He can see the picture of Arc getting constant physical punishments for exercises from the coach who monitored his boomerang training.
Arc hesitantly picked the boomerang from his hand Rimuru and looked between the boomerang and Rimuru again and again. But what can he do except try the boomrang, because he can not say that he did not understand what he explained before?
His hands were flimsy and shaking because he was still thinking about what would happen to his fragile hand if that blade of boomerang slashed it.
His hand movements were completely out of tune and then it fell on the ground.
"Man, I am still recovering from the effect of your medicine. My hand does not have the proper strength to use this heavy boomerang." Arc said before looking at the boomerang that was on the ground.
Rimuru hearing this laughed out uncontrollably like he heard the world record-breaking joke, "You are a fool for thinking that I would fall for that trick. I was using it when you may have used it to suck your thumb." Rimuru did not have this kind of joke and excuse, he noticed that even the first step was not properly followed in the way he explained let alone the whole thing which he was not expecting Arc to do on his first anyway.
Arc was stuck in his position without having enough power to try and run which made his situation resemble a child whose lie is caught and now about to face the punishment.
Rimuru quickly made up his mind and then took one scanning chip out of his bag which he had placed near the ground.
"Take this Chip and scan it on the portal of Official martial arts named ' Exploration Arts ' when you go back to earth. It will load a tutorial of a man teaching the stuff that I explained to you. You better have some sense of this weapon or I would. Or I would give a treat of electric shocks." Saying this Rimuru stuffed that chip in hand of Arc without even asking if he wanted it or not.
Gojo on the other side was staring daggers at two men who completely resembled the robbers he had seen before but he didn't want to kill them so easily and making them difficult required him to take physical measures instead of using his energy. He was looking out for a moment when they could be out of this market and then he could hunt them because he had read the rules of the market which were placed on a notice board-like place and it says that no people should be harmed in the black market regardless of how much you hate others.
Gojo was not giving anyone face but that Ryuga guy because he helped him once and he owed him a favor for it.