What happen to Naruto?

This time is when Naruto fighting with Pain and he in process to turn to Kyuubi, Sawaii is asking Sakura about what is going on and she feel a strange chakura from Naruto but Sakura wont answer it. A MISTAKE: Sawaii wasnt unaware of naruto's developing chakura of kyuubi...thats why she asked sakura about what had naruto's been experiencing since she wasnt with him ^^