Board Thread:Theories and Speculation/@comment-34661853-20181111160651/@comment-32685487-20181117193600

That is not an actual wood release tech. It grew FROM his arm, so it may just be the same with Danzo's arm going out of control, but in this case Obito can control it which was said to be Hashirama's DNA and chakra going out of control in Danzo's case.