Basically with the ASF so dad off only the Hyugss could see what was going on. Seeing Naruto and company in danger lead to the need to help.
Someone planned for the Yamanaka clan to use Shintenshin no jutsu (Mind Transfer Tech), but due to the distance, Hinata aimed where Ino should fire her jutsu. Easily able to see the Obito and Madara with a rod stuck in their necks Hinata aimed at Obito and hit him, and thus caused the misfire. Obito blocked it out due to the fact his own strong will was combined with the Juubi and even Madara (Via Juubi) technically