Hiruzen then again reminded danzo to bring back the ninja's from senju compound.after saying this he dismissed the meeting . Hearing this danzo had no choice and left and others followed him.
Ren seeing all of this deceided to disperse the clone ,then Ren in academy while listening to all of this has already made a plan and that was to kill danzo before the beginning of third great ninja war and danzo was now very weak has he don't have hashirama cells and sharingan.The reason he decided to kill danzo because he threatened to kill tsunade, and whoever have any bad interest on her is definitely on his hit list .
(Danzo)
He returned to the root headquaters and ordered root ninja to summon the spies from senju back.
After everyone came back ,danzo asked did you all gain any information.to which all of them said no ,and how they where not able to see through the the formation protecting the senju household.
Danzo already had thought about it being difficult but not even getting a single piece of news ,danzo then asked "how did you all get caught by tsunade" they said they had no idea and they were hiding at their absolute best.hearing this danzo was not able to kill them not because he liked them but because they were some of the best of root so he dispersed them.
Then after thinking for a bit ,danzo decided to send a root jounin spy ,to spy on Ren within the academy .he also ordered the spy to not go near the senju household and only told him to spy on Ren when he is in academy or outside the senju compound.the ninja bowed and then went on to spy on ren.
Ren was now within the training ground ,and he could sense a chakra around high jounin level following him ,Ren guessed that it may be danzo's doing.
Ren started acting like there was nothing and after having some random conversations with his classmates Ren waved at them and went towards the forest area of konoha where there were no people ,it was far from the border so there were also no ninja there.
The root ninja thought that Ren is going towards the forest in order to train ,so he followed him ,as soon as they reached little deep into the forest he saw Ren stopped and performed a handsign and to his surprise a wood clone came out of him which was identical to him.the jounin if he had not seen this with his eyes will not be able to tell who is the real one as they where nearly identical.
Ninja wanted to inform danzo about this but then he saw clone merge into the ground and a second later he felt a hand on his shoulder .he shuddered and jumped back and throwed a kunai with a paper bomb attached to it. It exploded right on the place where ninja was stiing on the tree but there was no sound instead there a wooden doom there which has contained the explosion and there was only a small dull sound. ninja was shocked seeing this but was forced to land on the ground as soon as he landed .
roots came out of the ground he tried to destroy them using his wind release :wind bullets but there was lot of them they caught his legs then another one as soon as his leg was bound he was unable to use his chakra efficiently. As every wood release jutsu's have chakra suppressing effect ,then also his hands where bound .he was like a sitting duck not able to move at all.then he saw Ren standing right at the same place from when the fight began.then another Ren came out of the ground who jounin thought must be his wood clone.
The clone emerged and spoke"hahahah,you are a jounin ,I could have easily killed you when you where sitting on the tree,and i laid a hand on your back but i wanted to experience and fight but it was disappointing I will not ask you questions ,so bye as soon as he said that two more sharp vines came out of ground and pierced the jounin root ninja directly into his heart and head ,where he had an mask.afterwards the roots pulled his body and went inside the ground and there was no clue at all.and the ground was brand new as Ren had sent all the roots back into the ground .
Then Ren dispersed the clone and went back to the senju compound like nothing happened .there was not a hint of regret for him kiling a human.there would have been if Ren had killed and innocent but here a killed a assasin who had blood of hundreds of people on his hand and Ren had already deceided to kill danzo so he will also destroy root .that is the reason there was no hesitation when Ren killed him....