" " speech. ' ' thoughts.
In a training ground near the uchiha compound
In training field that was littered with training marks a lone boy about 9 years old was in the center with a wooden sword. He was wearing black shorts and a black T with a fan symbol on his back symbolizing he already learned the fireball jutsu.
As he was going over sword forms he suddenly paused and looked around, black eyes scanning the surroundings as he scanned the foliage. After a moment he turned back to doing his sword forms since nothing seemed to be there. A black blur then came out charging towards him as he suddenly turned a threw a kunai.
The kunai did nothing to the blur as a massive cut appeared on his chest and the figure of a man in robe stopped behind him with a clink of chains as the boy fell face first into the ground.
"Cough"
The man turned his head as he looked at the boy on the ground as a pool a blood started to form as the boys breathing grew heavy. He stared at the boys black eyes though the single eyehole of his orange mask as a sharingan met black eyes.
"I thought you would've awakened your eyes as your still alive and conscious." the man said as he stared at the boy. "But it appears your blood is to thin, and you will die soon anyway. Farwell." the man finished as he walked away from the dying boy.
"Cough Cough"
'Is he gone?' the bot thought. His name is Uchiha Sasaki, and 9 years ago after dying after flying of a cliff on a snowboard he was reborn as an orphan of the Uchiha. As a former extreme sportsman who always chased a thrill he was exited, so long as he survived the massacre he could live out his wildest dreams, which was tonight.
'Now if I'm going to live I have to do something about this blood, lets hope this works." Sasaki then let his chakra flow throughout his entire network, as he did his eyes went red revealing a 2 tomoe sharingan, before a another appeared, and then the sharingan seemed to warp a six tomoe connected like a shuriken with three lines at the edge. (Imagine a six sided curved shuriken with the same 3 lines that Madara EMS has.)
'That's sweet and all but not what I need at the moment.' Sasaki thought as he went back to concentrating. What his goal was to let something he has been working on since he entered the academy four years ago and reading medical books. He was trying to take control of his own blood like the blood technique from JJK, this would allows him to live even if his heart got ripped out so long as he kept the blood flowing throughout his veins properly.
This required a ton of concentration and if he got something wrong or something like dirt something got dragged in he could kill himself, let alone if he loses control of his blood flow or incorrectly controls his blood. Hence why he almost religiously studied everything he could find on anatomy.
A few moments later the blood that pooling around him stopped before receding into his body as his breathing eased up and his sharingan when down to a three tomoe. He stayed there eyes open not daring slip into unconsciousness otherwise he will bleed out.
It was a few hours later when the anbu found him still breathing and brought him to the hospital for treatment. After investigating a bit the only other survivor was Uchiha Sasuke found physically unharmed in the center of the compound.