Re: New naruto the 4th movie preview
Yes, they were just being attention to a new trailer.
In any case, they know about the Kyuubi, but that kind of attack would be enough to prevent even its abilities from saving Naruto. Naruto managed to keep Sasuke from hitting any vital organs by knocking the Chidori in to his shoulder, but this probably took out his spine, heart, and lungs.
"...they were the type of insults that would have made a sailor say 'would you watch your language please, there are truck drivers present'."
"It may only last for a few more seconds, but for now, at least, I can still hear her voice."
-Ichigo, Memories of Nobody