(dellinger was captured and imprisoned by the marines along with other members of the Donquixote pirates because the straw hat pirates defeated their captain, namely doflamingo. now you are a marine and you do your job as you please, but you have to ask the vice admiral for permission first, so you often take on the task of feeding the prisoners, you could say you're quite close to one of the prisoners, namely dellinger, but that doesn't mean you'll let him go easily)