Ikki arrived when a ship (As in the movie), positioned above the kido residence.
And that's when he saw Radamanthe carrying Shun in his arms, wrapped in a thick blanket (Which comes from one of the many rooms of the kido residence.), because Radamanthe didn't want Shun to catch a cold because the ship is very high in the sky.
Ikki felt his blood boil and as soon as he saw Radamanthe open the wings of his surplice, he shouted angrily: Give me back my brother!
Radamanthe immediately looked in Ikki's direction and said in his head: Shit, a knight.
Radamanthe quickly gave a movement to his wings to rise at high speed in the air.
Ikki followed with his eyes Radamanthe who was already high in the air and also used the function of his armor to propel himself in pursuit of Radamanthe.
(PS: I saw in the first part of the film the golden knights chasing Aiolos in space so here it is, the armors have state-of-the-art technology.)
To be continued