His Sharingan came in handy for things like this, although most of its use throughout his entire life has been for combat situations. It had some uses for investigation, but not as much as the Tomekenzangan from what he could tell so far. So far he could deduce that those eyes allowed the user to see the past, present, and future, but it didn't grant any true enhanced perception as the Sharingan did.
"That's fine... You can use your Tomekenzangan to confirm my hypothesis." The evidence was there, but it is always nice to have some confirmation whether his deduction was correct or not.
Rentaro let Haruka do her thing, the cuts in the surface were likely done by a kunai or maybe a blade, but kunais were used quite often for combat so the most probable cause of those cuts was from a kunai. He then turned to look at Haruka that apparently needed him for something and even went ahead and gave him a smile like a puppy wanting something from his owner.
"Yeah, yeah, alright..." He let out a sigh and went to the other room, it was true that something else could be found in the other room.
He made his way towards the other room and used his Sharingan to look deeper into the place, the small details that the naked eye was unable to see. Rentaro looked at some small cracks on the floor which could indicate the battle continued around this place, or maybe they were two battles going on. It was not out of question, but he wasn't fully convinced about that. The man continued looking at the room and noticed a small crack on the wall as well, instead of slicing with the sharp object, it was instead thrown with force and it hit the wall instead. But, it was nowhere to be found so it meant that it was taking right after.
So far his hypothesis consisted of the possibility that the fight broke out on the previous room Haruka was in and continued all the way to this room. As the kunai was thrown, it was probably picked until after the battle was over so prevent leaving behind any significant evidence. Rentaro's left eye then focused on the small thing he noticed on the floor, below the crack on the wall. It was a single strand of hair, probably when the kunai was thrown it had managed to cut a small portion of the person's hair.
He carefully picked up the hair with his hand and placed it on his other hand. Well, it was at least a small bit of evidence they could find. It was probably so small that nobody would've been able to see it under normal circumstances.
"I found something." Rentaro called out to Haruka that was in the other room, he hoped by now that she would've probably found something too or figured something by now.
SAs Used:
Genius Intellect
From a young age, Rentaro has demonstrated to have a high level of intelligence. Although, lacking aptitude in ninjutsu when he was young. He was able to understand ninjutsu theory with ease and has proven to be able to discover possible applications through its knowledge. Scoring the highest in Academy written exams without any issues. Always keeping track of people's mannerisms, strengths, and weaknesses. His remarkable intellect allows him to be several steps ahead of his enemy. Due to this, he is able to see through deceptions and elaborated lies that may fool the average person. He believes that one should get to know their friends, but get to know their enemies even more.
Using tactics that would otherwise be considered be rare and unconventional, is due to the fact he has spent quite some time studying multiple types of combat theory. His intelligence tends to shine through elaborated plans, where he takes into consideration the enemy's strength and the strength of his allies. Followed by resources, time, and other external factors in order to determine the best course of action to deal with the enemy. His strategic thinking mainly relies on small, but quick victories in order to reduce the amount of burnout of his forces and keep the use of resources to a minimum.
Chakra Tank
Rentaro has always possessed high amounts of chakra. One of the reasons why he struggled with ninjutsu from a young age was due to his inherently large chakra pool. Which made it hard for him to initially use jutsus efficiently. Due to the high amount of chakra, he possesses he is able to fight for long periods of time and use multiple jutsus simultaneously without getting tired. This gives him a higher amount of endurance compared to the average Shinobi.
Sharingan (Active)
The famed dojutsu of the Uchiha Clan, an ability very few people can achieve. Although, Rentaro isn't an Uchiha, due to the fact that the eye was transplanted to him from a young age. He was able to access the abilities of the Uchiha Clan's dojutsu, despite not having Uchiha blood in his veins. This increases his perception, awareness, and reaction time. Allowing him to read the movements of his opponents and copy any jutsu that is performed by a Shinobi. He has access to all the abilities of the Sharingan.
The Sharingan is truly Rentaro's greatest asset in a battle, but it also acts as a double-edged sword. Due to the fact that he has no Uchiha blood, it means that the usage of chakra for using the Sharingan is much higher compared to the amount of chakra an Uchiha would require to keep it active. Aside from that, Rentaro is unable to deactivate the Sharingan, so it's constantly active. Because of this, he is forced to cover his eye with a black eye patch to prevent the eye from draining his chakra. Through extensive training and battle experience, Rentaro has access to the Three Tomoe Sharingan.
Enhanced Agility
Rentaro possesses agility that makes him excel in combat, allowing him to move faster than the eye can see with relative ease. This is the result of his extensive training to improve his agility to complement his Sharingan's ability that increases the user's perception and reaction time. Because it doesn't matter if you can see the enemy's movements if you aren't agile enough to dodge them and counter-attack them.
Purple Lightning
A rare ability to use Purple Lightning, through studying ninjutsu and chakra nature theory, Rentaro learned to use a much more powerful version of lightning. Just like the name suggests, he is able to generate purple electricity in some of his jutsus that have increased power. Rentaro normally uses this to engage enemies from a distance.