The first fight
Before he can utter any more words, Hajime who was looking at all this with amusement appears in front of him again and taking advantage that he was very shocked seeing his Rinnegan. And so punching him in the face, very hard, sending him flying and across the mountain, and thus bouncing in his path like a ball, with no way of stopping, until the moment he hits another hill and stops with a considerable impact.
'Was it too strong, I don't want to kill him, he still has many uses that I want to provide, especially his Clan memory, where I can keep in mind more or less the power of the Otsutsutsuki Clan'. In his blankness, but still very much on the lookout for any suspicious movement from Jigen, Hajime keeps watching the figure in the dust that has risen from the impact.
Jigen Pov:
After taking such a powerful punch, Jigen who was stunned to see those eyes was even more so after punch was taken. Isshiki who suffered greatly from that impact, took control of his body again with more strength, and rigor, because this would be a very big battle, even more so since he doesn't have much of his power, and in a body that was adapting to being controlled by him.
And lifting his body, a little bewildered, and spitting a little blood with some teeth that were lost by the force he thinks to himself, 'He is strong, and this for sure he was just kidding, because who has those eyes could kill me in my state very easy, and besides he is different from our race, I can feel it. So he has something to do with that damned woman, I have to find a way to fool him, and so I can get out of here, and rebuild my power little by little.
And looking in the direction where he thinks he is feeling him stopped, he says "Why are you attacking me, I've never even seen you, I have nothing of value, you can even see where I'm living, what is your motive?". Hoping that way he can buy some time so he can regain some strength from his human shell.
"Let's stop this, I know and you also know why I'm doing this. Let me see, now you must be thinking of a way you can trick me and run away. And thinking that I am half-blood of your race, and also wanting to find ways to use me to counter let me see.... my mother, right?" Hajime asked innocently because he has to act like it, he and a child who was born in an era of peace, so he and pure. Pure Pride and also narcissism, much like a certain prince of a nearly extinct Race in his universe.
Hajime Pov:
'Even though I am trying not to be arrogant, I am unable to control this urge that I never had before, now I may be understanding the meaning of battle thirst. I have been waiting for one since I was born, and this will be my first one and even if my opponent is much weaker I will limit myself to his power level, I just can't be too arrogant, because that in the future might kill me, so this has to be well engraved in my Soul'.
"Let's have enough of that, I think it's time. Let's Dance." Speaking as maybe a descendant of Hagoromo would speak in the future, Hajime stops using his Rinnegan and goes on Jigen, getting into a fistfight, trying to hit his Tenketsu with the help of his Byakugan. Even though Jigen doesn't have Isshiki's eye skills. But still having an Otsutsuiki in his body he knows the means to fight against a Byakugan, and like it or not he has more experience in fighting than Hajime, because he invaded many planets, where many had life forms in what would be resistance, and thus acquiring a certain experience.
And then deftly deflecting the mother coming at his tenketsu in reverse, he throws a beam towards Hajime, who even though he expects it to come and catches him off guard, as a beam coming towards him, seemingly out of nowhere, and surprising. Using a form of body shimming, and dodging very easily, he gets back in front of Jigen, giving him no room, and without delay, they begin exchanging many punches, and kicks, as the two go about testing each other's skills, trying to gauge strength and skill.
"Hahaha, even though you are a filthy half-blood of our race until you know how to use those eyes that bitch gave you."
Looking at what this future lab rat is saying Hajime even finds it funny," I guess for someone by half you shouldn't talk such complete things Hahahaha". Seeing that this worked as he got annoyed, he starts to hit various areas of his body, being aimed at his tenketsu, vital areas, exposed areas, and more. Even more with his knowledge of the human body that he gained after being in this world, so he has a lot of knowledge of the body and how to exploit its weakness.
Jigen breathing heavily as he was slowly losing, and this way he might end up dying even before he gets his revenge, 'I'll have to use some more of my power, even if it means having to leave this body, and look for a next one because this one won't hold much longer.
Hajime who was waiting a bit to see what his opponent's next move will be like is surprised by a firm resolution that appears in his eyes, "So you've made up your mind to go a bit more serious, so I think it's time for us to fight more fiercely then."
With a firm resolution and piercing glances, they decide that no more fooling around, that at least and the decision of who is on the losing side, because he has no way out, literally, because he is in a blocked space, that no amount of ocular skill can save him, but this he doesn't know.
(First fight scene I'm doing, so I still have a lot to learn, and would like your opinions on how this one. Thanks for the Support!)
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