You gotta remember that Sakura tried to kill him first and almost succeeded but has weak resolve.And yet the idiot was reacting like that over someone who would kill her , im sorry but making light of her possibly trying to kill shika for such a reason just her makes look like a impulsive ass , which she isn't.
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Not to mention shika would've negged her in that situation with Shadow bind before she threw a punch anyway..
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Meaning Sasuke did what he should've, tried to kill the person who almost killed him.
While Sasuke also tried try to kill her, except with stronger resolve.