How did Haruno sneak inside the island? That's simple my friend. First, he sneaked inside a ship, then he used his Akuma no Mi to open a gate to his room, after entering the room he made a tiny portal and hid it to let see around the ship. The ship had a lot of food that the pirates stole, Haruno didn't care about it he even stole some fruits from the pirates! Well, after waiting for some hours, Haruno heard a noise coming from upstairs in the ship and concentrated to detect the sound... He could hear the entire conversation: "Captain bounty got up! It is becoming higher and higher every time!" Another voice said: "Yeah. Talking about bounty... Do you guys heard about the new pirate hunter Fire Demon?" Fire Demon...? Who's that? Haruno looked behind himself and asked Torryk who smiled and said: "It's you. Sensei." This sentence made Haruno stunned who pointed with his index finger to himself with a confused expression and got a nod as an answer.
That day Haruno discovered about his nickname and became depressed, he sighed and continued to hear the conversation outside: "Fire Demon? That guy isn't crazy to go to our base! We have four hundred pirates gathered in our base, if he comes he is crazy or... Crazily strong." Haruno smiled because now he knows the number of enemies that he will fight with and if it is necessary he can call Gaharudo or Burtosy to fight with him. Well, Burtosy has a size like the Banana Crocodile but his body is very flexible and he can swim very quick too and his mandibular strength is like a shark, his scales are hard and sharp too. While Gaharudo can use his Akuma no Mi and attacks with lightning attacks and use his claws that after he ate the Akuma no Mi became sharper and his feathers that he can throw off his body and use it as a conductor to his lightning strikes. So Haruno doesn't fear four hundred pirates.
Well, Haruno learned to fight with his friends, using his portals he can teleport Gaharudo's feathers and change the lighting direction, he never tried to teach Burtosy to use something like Haki... But he actually learned it, at a low level but learned it. Burtosy can use Busoshoku no Haki to make his tail stronger, Haruno at first didn't know it but after observing Burtosy fight he noticed something different in Burtosy's attacks. Well, back to the ship~ Haruno heard the conversation between the two pirates and after one hour they arrived at the island. Obviously, Haruno won't attack now in daylight so he waited until dawn. When dawn (Pokemon!) arrived Haruno left the ship with his sneaky mode on and behind him Torryk followed him.
Haruno saw some constructions... It seems that this island had a villa... But the pirates killed them all? That's sad. Haruno heard loudly laughs and music, they seem to be having a party or something like that. He saw a big campfire and sake barrels, several drunk pirates danced and sang the music 'Binks no Sake', others played cards in a table, another one was sleeping with a bottle in his arm. Everyone was having fun. It will be a pity when they found out that their creates that have bounties would die... Really a pity.
Haruno smiled while using his portals to sneak easily, looking at the pirates and humming along with the song. After searching for a few minutes he found a special place where the pirates that had a bounty were, they were drinking wine while chatting with each other with red cheeks. Two women, a muscular man with a hat, a slim man with a gun in his wrist and an... That is a Fishman? Well, blue skin and sharp teeth... It seems like one. But, why would a Fishman be in a crew of human pirates? That's a mystery. He looked at them for some minutes before saying to Torryk: "Let's go in." After saying it he opened a portal and jumped inside, appearing beside them and with a happy smile said: "Goodnight friends." Behind him, Torryk smiles while trying to sneak peek a bottle of wine, but Haruno grabs his hand while saying: "Kids can't drink."
All the five looked at Haruno with surprised expressions for two seconds before making a fighting posture. Haruno sighed and activated his [Soul Eye] skill to see if they had an Akuma no Mi or not and a fearful expression appeared in their faces. Haruno saw that the two women had Akuma no Mis and the muscular guy too. Haruno sighed and a bag appeared, he warped it in his wrist and said to Torryk: "You have the thin guy and fisherman. Be careful with the fisherman." Torryk nodded and grabbed his weapon, the weapon that he uses is the same as Ace, Luffy, and Sabo used. An iron cane is light and can do good damage when used. Haruno decided to do one thing, first, he attacked with a stone the big muscular guy and the two girls.
The muscular guy couldn't react in time and the stone hit his belly making him spit out blood, the first girl, with yellow hair used her Akuma no Mi. Creating a tiny layer of glass to defend herself, it was a very strong glass but the stone broke it easily. The second girl, with black hair and glasses (not Tashigi.), just dodged Haruno's attack. So he couldn't see her Akuma no Mi. Then he smiled and used his Akuma no Mi teleporting the yellow-haired one to of his rooms.
The yellow-haired woman just blinked her eyes and she was already in another place, blue walls, ceiling, and floor. She looked around herself just to found a giant crocodile looking at her with a 'smile'. If she didn't have fainted she would see some fruits in the corner of the wall. And yeah...