I can do a little summary until you give full version.
- Pica regenerates his left arm to attack Luffy group.
- Luffy attacks Pica head with Gomu Gomu no Grizzly Magnum and destroys it.
- Real Pica's body appears to defeat them (he has a big katana), Zoro fight with Pica.
- Law tell Luffy that Doflamingo killed his friend Corazَn 13 years ago.
- Corazَn was Doflamingo's younger brother.