Im talking about tayuyas not frog genjutsu. I cant remember now but i think it works different.
Sasukes and Itachis case its obvious PNJ cuz its much cooler story to break it just like they did.
You actually shoud bring to me some pictures where is stating that pain wont break sound genjutsu, shoudnt you?XD
I was talking about sound genjutsu period lol, they're different types of sound genjutsus just like their is for visual genjutsus. I never said pain wouldn't break sound genjutsu only that it more than likely requires more pain than visual genjutsu so biting of the lip wouldn't work for all genjutsus and that's including visual genjutsus too. Who would be scared to face a Sharingan user if all they had to do was bite their lip? Kurenai did it because that was her genjutsu that was used back on her and she knows it's weak points.
In Shikamaru's case, why use more chakra to make your shadow break your finger if you can save the chakra and bite your lips if it would work? He didn't have a high stamina so why use the chakra?
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and the pain is shown to still be hurting him afterwards so it was worst pain
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The only plot I saw is that if you look at Itachi and Sasuke, they were able to turn their heads to look at Kabuto and each other while Shikamaru's arms in real world resembled how it was in the genjutsu. So Itachi and Sasuke shouldn't even be able to move their heads since their movements were stopped. They escaped by plot over anything.