Board Thread:Versus Debates/@comment-31338621-20200309130706/@comment-26636534-20200324003742

Jason of the Mangekyou wrote: the spreading i'm referring to, is Torune spreading the insects over his entire body, Obito didn't see that part. He only say that if torune touchs you with his fist you get infected or whatever. Obito's Sharingan saw both the individual beetles and the chakra they had. It's why at first he thought Torune was using a jutsu that sends chakra to destroy cells, when he observed Torune's jutsu affecting Fuu. So, the moment Obito pops up to warp Torune, he is aware of Torune's full body insects due to his Sharingan, which is why he also comments that his arm is infected after contact.