What you need to pay attention two is, When fighting Both Naruto and Sasuke, he was on his guard. He was expecting them to attack him or go for his "blind spots".
When Sakura attacked him, he wasn't on his guard since both of his oponents were infront of him in full view and he wasn't expecting a 3rd party to come into the fight. he wasn't actively looking in every direction or really paying massive attentions so his surroundings since as i said both Naruto and sasuke were standing infront of him.
Also look at the 3 eyes on his head, All pointing forwards looking at Naruto and Sasuke (mid panel)
You must be registered for see images
Take ya sakura wank somewhere else and stop using that scan.