An exclamation mark used to imply 'surprise'.. which was probably to denote her surprise about how easy it was to escape Naruto and Sasuke because if she actually did see Sakura, she wouldn't have been surprised and had questions about the hit as we can see with the question and two exclamation marks.
It has been implied before with Hinata that 360 or all views of the byakugan aren't necessary always active all at the same time except the wielder wishes them to be which makes sense. [
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