Sanji is afraid of King 's beak despite using RS while no sword was used even master luffy sensed him
Shinoubu: Sangoro!!
Shinobu: Please hold on tight!! Master Momonosuke
Sanji: Hey! Hey! Hey! this isn't good. It's dangerous!!!
Sanji: Stop it! you bird bastard!!!
Sanji: A hole will get opened up in my belly and I'd die!!!
King: It won't end with just a hole, I plan to render you in half!! Disappear and try running away
Sanji: Disappearing is a matter of visual perception (i.e. not seeing), let go of me!!! (puck note: I'm guessing that Sanji is saying that him dissapering wouldn't really matter in this scenario coz King already has a hold of him. Even if King cannot see him, it's not like Sanji actually disappears into thing air, he still has substance, hence can be touched/felt)
???: Woah!!!!
Luffy: Sanji~~~~!!! That was dangerous!!!, the attack just now!!!