Sorry if this is a little sketchy. I haven't watched One Piece in very long time.
Akainu was disgusted with the duo before him. His natural repulsion against pirates didn't hold a flame to what he felt in that moment. The pirate King, Gold Rodger, Dragon the Revolutionary; these two men's sons being step-brothers was too frightening of a thought to bare in mind. How could he pass the golden chance of getting rid of both boys at once? He didn't have to search the seas nor file ridiculous amounts of paperwork just to find one of them; they had presented themselves on a platter before him and it was too good to be true.
"Your fate has been decided!" Akainu shouted as he clenched his fists. "Regardless of who else gets away, I swear to never let you two escape!" He paused as he looked at Ace's slumped form and Luffy's a few metres away. "Now take a good look..."
"Wait!" Ace looked up quickly as Akainu leaped pasted him with surprising speed. Maybe it would have been best that everyone had left him to be executed... Whitebeard wouldn't have to be left behind by his crew and Luffy wouldn't be down on his knees with a admiral heading straight for him. "Luffy!" His body moved before he even realized what he was doing. The panic that filled his chest made him feel like he was drowning as he made his way across the distance. Luffy was too busy trying to pick up that dam vivre card to take notice of his surroundings. He wanted to yell out to his idiot little brother again, but his throat seemed to collapse in on itself. Ace held his breath as he jumped in front of the Strawhat Captain using his back as a shield, fully aware of what danger he was putting himself in. At the moment, anything seemed worth it as long as his little brother made it out of this alive. His heart was too loud in his chest for him to notice the silence that had covered the battlefield and for a moment Luffy forgot to breathe. A moments breath passed by, followed by the next... and the one after that... Ace opened his eyes, he didn't remember closing them, but that was besides the point. Where was the burning pain? There was no way it would take the admiral that long to...
"Who the hell are you?!" Akainu's angry shout echoed across the stillness of the battlefield. Luffy's terrified wide-eyed gaze was all Ace could see as his body trembled. Although Ace's body failed to respond to his commands of moving to see the situation behind him, he was still able to take notice that dam vivre card was carelessly trapped between his brothers fingers. His moment of shock was placed with a flare of anger; that dam card nearly costed him his little brothers life! "Luffy, you idiot! Do you not have enough fuc-" Whatever he was gonna say was cut off when a hand landed heavily on his shoulder, the firm grip and unexpectedness of it all caused Ace to flinch, but the anger he felt quickly turned on the other person. "What the hell do yo-..." Once more he cut himself off, the words quite literally dying on his tongue as it suddenly felt like he had swallowed sand. The past few days events finally seemed to catch up to the older raven-haired boy as his body slumped in exhaustion, falling forward onto his little brothers shoulder.
"Gaki, take your brother and leave."
Marco watched with wide eyes as Luffy all but dragged Ace towards the ship of Whitebeards as if his previous injuries was nothing but a memory. The rattling of his sea-prism stone handcuffs broke the blonde out of his trance, "Hurry up and get these things off." His fellow crew mates tugged at the last cuff completely ignoring how the stone bit into the mans wrists forming nasty cuts. Marco opened his mouth, ready to tell the men to just yank it off as hard as they could, but he didn't get the chance as a sudden gust of wind sent them flying backwards. The automatic reaction to close his eyes didn't allow Marco to see just who had attacked them so when he hit the rough boards of his captains ship, he was more than a little confused. Who would form an attack that would send him back to his ship?
"Oi, what the hell was that?!"
Marco glanced over to see his crew mates that had been spread across the field just moments prior. Someone had helped them get back to the safety of their ship... But no one that Marco knew of had the power to sweep so many people back with just a gust of wind... was there some type of wind devil fruit? A grunt brought Marco out of his thoughts as he sat up to see Whitebeard laying against the main mast, his bloody chest had strange scribbles painted across his skin but he looked virtually well. "Pops? What's going on?" The man kept his eyes closed. Just when Marco thought the old man had passed away or went to sleep, he got answered.