That is probably one of the worst crimes you can do towards the WG, way worse than destroying their flag. Also because that would be a moment "god can bleed too" a bit like when at the end of 300 Leonida injured Serse. So I guess Kizaru would be sent with the order to kill Zoro and all his crew no matter what, maybe to leave the body intact to later dismember it as a reminder to prevent others from doing the same (a bit like what England did with William Wallace, cut to pieces and sent them to the 4 corners of their kingdom, or at least at the end of Bravehearth the narrator says so) or simply directly send Akainu and trasform the Sabaody in a magma pool (that wouldn't be too farfetched too considering the crime).