Ch. 857 Rook
Chopper and the others call out to Luffy and Sanji from the mirror world.
Sanji is surprised to hear their voice from a nearby dropped mirror.
Luffy and Chopper confirm each other's situation.
Luffy tells them that they're gonna crash the tea party and wedding ceremony.

Jinbei tells them that the ministers met so far are the tip of the iceberg of the Big Mom pirates and those veterans will be attending the tea party.
And they will also have to take into account the lords of the underworld that were invited from many countries.

Jinbe then starts to talk about Bege's true colors.
In the West Blue, there were 5 strong mafia that controlled the underworld society.
One of the bosses was Bege, and he was a cruel man who enjoyed cutting the heads off of animals and watching them squirm.

Back in his gang days, he targeted the other bosses, but he was only interested in taking their heads, not showing any interest in area or territory.
He reveled in the bloody war for supremacy.

On top of that, he killed his would be avengers from his iron castle and laughed at their regret.
Still being chased in the seas by those seeking revenge, Bege found a good cover as a Yonko's subordinate.

After buying his honed cautiousness and defensive strength, he was made a fighter "Rook" rank, and was entrusted with full authority in defense.

It appears that Bege is using is dull authority to take the head of Big Mom who is obsessed with killing the Vinsmoke and taking control of Germa.

Thinking that this is not the true to make them enemies as well, Jinbe proposes to Luffy and Sanji about making an alliance with Bege.

Luffy agrees with Jinbe's proposal.
When Jinbe gets in contact with Bege again, it's decided that they're gonna go meet him right away.

Whole Cake Island Northwest Firetank Pirates Secret Base

Bege: "Jinbe isn't the type of man to joke around. It's a good argument to increase the number of people seeking to oppose Big Mom."

From Sandman at AP

OK. Here is my translation of the last sentence (ベッジ「後は麦わらの出方次第…！イケ好かねえ時はここで消すまで！」).

Capone is wondering how Luffy will react to him. Capone also says that he will meet and kill Luffy if Luffy turns out to be not a likable person for him.

Capone also says that he will meet and kill Luffy if Luffy turns out to be not a likable person for him.

One of the bosses was Bege, and he was a cruel man who enjoyed cutting the heads off of animals and watching them squirm.

D'ailleurs ça partira surement en couille entre lui et Luffy à leur rencontre, mais encore une fois, vu le peu de chapitre qu'il reste, BM ne peut pas tomber, ça serait complètement bâclé.