Doubt the blackmail really changed the outcome that drastic. Niji already outspeeding sanji when he could move right behind him. (If niji wanted, he could just kick sanji without holding him first). Niji also mocked sanji for being slow when they escorted luffy out of cocoa island. Judge was right to protect sanji against niji (judge wanted the wedding to still go, so he didn't want sanji to be slaughtered beforehand)
If you said that sanji getting hit was just for reiju showcasing "germa technology" on his face, then the same can be said for judge where the human wall was just meant to showcase the clone technology in a fight
Niji, Yonji, Ichiji and Judge were mocking Sanji for anything, for helping someone bein threatned, for cooking, for eating wasted food from the floor, do you think he would miss the chance this time, lol??
The Raid Suits are the best thing if you want to boost your speed and fly limitless without a drawback (like having a Devil Fruit like Marco's, or being someone like King), this was the point of the scene (it also showcased it's bulletproof, fire resistance and speed boost), Sanji didn't asked for help, despite the situation being difficult, the Vinsmokes felt in debt by Sanji saving them getting killed, they stated that very clearly. Skywalk isn't
Whatever what Judge wanted to Niji to do, these mfs would beat someone innocent, mention Zeff or take someone as hostage just to hold Sanji back, like they did with Cosette for example. Thats what Sanji's sibling and Judge did on EVERY OPPORTUNITY they had
Niji already outspeeding sanji when he could move right behind him. (If niji wanted, he could just kick sanji without holding him first).
You didn't even see the scene
You need two mfckers threatning his father one after the other in order to do something against him
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If you said that sanji getting hit was just for reiju showcasing "germa technology" on his face, then the same can be said for judge where the human wall was just meant to showcase the clone technology in a fight
Lol, 300 I.Q comparison

, this is an hell of an stretch, damnn
First of all, what does Sanji refusing to hit a subordinate and getting shocked by it has to do with Sanji's situation with Niji and Ichiji?
Actually Luffy and Sanji are the ones who sometimes get these faces when they receive a beating, which means nothing but comedy attached to the characters since ever
Sanji's face was pointless to showcase his state, it was used to show Reiju taking care of him despite of him not giving a shit about it, Judge showed to be an asshole many times, including "creating" real people to kill when it's needed, Sanji also didn't knew it was a clone, Yonji showed it to him chapters AFTER that, even when he knew everything about it he got more pissed than before.
Luffy, Zoro and Sanji would act the same way on this situation