
When did this happen?
Sanji created Ifrit Jambe with improved CoA and the Exoskeleton. It's pretty clear Oda's attempt of making us believe that Sanji is a Lunarian, then he comes up with a whole new flame and even explains that the only thing holding Sanji back to increase its heat lies on how much his body can endure it
His durability just with the Exoskeleton is so far out of this world and the Brachio Snake thing + Queen's sword shattering on Sanji's neck is more than enough to show this
Everything about current Sanji far surpasses Lunarian capabilities, he may not be just as good as a flame "on" Lunarian at tanking stuff, but given all the damage he took, just to faint for like 10 minutes after beating Queen, its not something to be slept on.
You mean a standard , no name beak attack that put Sanji on his ass for an entire chapter?
I wouldn't call it no name or random weak move
Its more of a signature move based on his DF. Basically King's version of Queen's "Brachio Bomber"

When did this happen?
You mean a standard , no name beak attack that put Sanji on his ass for an entire chapter?
I see this a lot. Which confuses me cause...
King literally had him by the throat. How do you sneak attack someone that you're literally holding?
Right, he grabbed him by the throat right after Sanji blocked his kick, Sanji didn't even fought it back during this sequence, he was completely focused on guaranteeing Momonosuke's safety, then after he sees the opportunity he throws Momo to Shinobu then he praises Momo and right after that we can already see King is divebombing with Sanji in his beak. Which shows all the way King took complete advantage of Sanji's almost intentional unawareness
And still, looked fine afterwards