Board Thread:Episode Discussions/@comment-1181222-20170823100207/@comment-35622277-20170823205601

Thekillman wrote: Naruto didn't see the stab coming, he was too slow. I've said this before, but most power in Naruto is active: if you don't spend effort to sense or protect, you aren't sensing or protecting.

Naruto lost his cloak not because he was stabbed, but because Shin's mark also extends the control to whatever the weapon is stabbing. IE he could use it to maneuver his clone in the way of the fireball, but also extend that control to force Naruto down and Sasuke to be immobile. Lastly, Shin was out to get Sasuke, so Sasuke using Ameno on Sakura would be a waste of a good Ameno use and play right in their hands. Yes, it's most probable now that Naruto needs to be actively applying some kind of reinforcement to his cloak in order to prevent attacks from penetrating it. Seeing as how he thought nothing could touch him within the confines of his protective shield, and the fact he didn't anticipate Shin's ability to manipulate weapons other than his own, he was completely caught off guard.

Though I find it odd Sasuke jumped into the cloak at all, and didn't just deliver the final blow to Shin while he was downed.