Sevastian walked up to the deck to find the entire thing clear of any sign there had been a mass of blood there minutes before and Walter leaning against the ships mast with a mop. "Paying respects to the dead? Sounds like fun. Enjoy yourself." The mad hatter said walking towards his ship. Walter spoke to him before he could actually leave though. "Captain, is there anything else worth taking or can I finish up?" This caught Sevastian by surprise, mostly because Walter hadn't searched the ship himself yet which most pirates would have done. "No Walter, I think you can finish right now. There is still some gun powder and alcohol down below though, if you have a use for it." He jumped back to their ship, set the barrel of rum down, then spotted Hisoka. "Hey you! Why don't you do your job and check on the weapons?" Having given that order he walked over to the helm of the ship ready to turn away from the merchant vessel the moment Walter was back.
Walter had listened to the captain and gone below the deck to find the alcohol and gunpowder. Once he returned to the deck he had two small barrels with him, one just emptied marked that it was to carry gunpowder, and one of rum, and in his more free arm a small torch that was lit. He dropped the empty barrel and opened the rum only to dump it onto the deck of the ship. Finally he returned to the Very Merry Un-Birthday, glad that the captain turned away right away. After waiting a few seconds he threw the torch onto the merchant ship's deck and it instantly caught fire. About five minutes after that the whole thing blew to pieces, but at that point they were far enough away that their ship only shook a little.