I don't think Hidan will be fooled for a minute. I mean, he has to know when he's pierced his own heart, right? If Shika doesn't have a wound, that means his technique failed. So he'll know right away that Shika tricked him somehow and try to get away to rejoin Kakuzu. It will be interesting to see how he tries to break out of Shika's net of exploding tags.