Board Thread:Episode Discussions/@comment-1181222-20170823100207/@comment-1512913-20170825214938

Reasonable explanation none of you folk thought of. Perhaps when Naruto goes Tailed Beast Mode and creates Kurama avatar, the cloak's protection might extend to the avatar itself, meaning it protects from outside threats, but anyone within the avatar doesn't have protection if the attack comes from within. Think of it akin to Susanoo, it blocks attacks, but if anyone were to enter Sasuke's Susanoo and stab him, the Susanoo wouldn't help anything while the attack is already within