Alexander
"Alright then," he said as got up, "I'll jump first since I can kind of tell where they are. Then everybody else can aim for me." With that he squared up and looked toward the first platform. He watched the apple core as it moved for a time, then when he felt confident in the timing he took the cliff at a run. As close to the dropping face as he dared he coiled his leg and sprang forward, flying out into the the thin air with his arms swinging behind him for momentum. His other foot struck almost right next to the apple core...! Only for him to realize that it hadn't landed toward the middle as he'd hoped it would, but had tumbled closer to the edge of the platform- the edge that his foot had found and was only halfway on it.
With neither room nor time to recover and redirect his momentum, Alexander first began to slip and then to fall outright into the abyss! His eyes went wide with surprise and his mouth opened as he started to fall, but as he fell below the fog it wasn't a scream or a yell that came out. Instead, acting on raw instinct and well-entrenched muscle memory, his hand curled into a fist with his index and thumb curled out almost like pincers and flew towards his mouth which swiftly closed on the tips of his fingers and released a shrill whistle out into the air. He hadn't even paused to remember that Julie wasn't here; when you fell into the sky, you called for your bird. It was second nature for someone like him.
But before he could recognize that his feathered companion wouldn't answer his call and admonish himself for thinking that she would, something else responded instead. A massive updraft suddenly formed in the air around him, slowing his descent and then blowing harder still until it was propelling him the other way, back up toward the platforms! With a great burst of air and mist he erupted out of the fog again and landed firmly on the platform, smashing the apple core under his shoe as it rolled toward the center with the force of the updraft. His breathing was fast and hard in the wake of the landing, and it took him almost a full minute before he managed to get himself to his feet again. "Holy crap," he whispered to himself before shaking his head. "I am never gonna get used to that sort of thing. Right then, let's make sure I know where the middle is here..."
He took a moment to careful plot out the platform with slow, wary steps, stopping when his toes no longer had purchase and then counting his steps. First in one direction, then the other, until finally he stepped to a corner and recounted from both sides to place himself as close to the center as he could. "Alright!" he yelled to the others, "Aim for me, you should be fine!"