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Knives penetrated Hulk's shoulders.

We can't be sure if they can penetrate his skull for a KO.

Well if Warpath battle cries his blade with a roar it might absorb the sonic blast and lodge in the Hulks heart.
http://w7.pngwing.com/pngs/861/324/png-transparent-marvel-comics-the-incredible-hulk-illustration-hulk-carol-danvers-marvel-comics-marvel-cinematic-universe-avengers-avengers-comics-superhero-fictional-character.png

I mean if the knife splits the cry it could act like suction against the insertion and get a fast kill.

Hulk will likely heal from that if it happens.