Board Thread:Theories and Speculation/@comment-26005711-20150719134117/@comment-5936871-20150721192514

@Action Kurama has never been noted to have a powerful life force though, and what Kuro said is true, it's already been established that when the beast is extracted the Jinchuriki dies, Naruto only survived cause he's an Uzumaki. So once Kurama was sealed back into him, Naruto was alright.

The reason wood release reacted to Kurama's chakra is because Naruto was using the Yang half of Kurama's chakra, which relates to physical energy and life force.