No need to say anything to acknowledge the request. He nods, turns to face Law's side and gets on his knees, then reaches to gingerly pick him up without grabbing across his injured side. He's not going to ask if Law wants to walk there, either. He hauled him around enough as a kid, he can still do it now. This has to be more efficient and less dangerous than trying to get him to stand up.

"I'll keep an eye on you." For however long it takes. He'll make sure Law is comfortable, and most importantly, that nobody even dares to try and do anything to "help" because while they may have the best intentions, if Law says not to move him, then that's the final word on the matter, unless something attacks the submarine maybe. If Rosinante leaves at all, it will be to make sure there's food and water and clean bandages and more available to Law whenever he's awake again.