A hand reaches out to steady Chrom before he could impact into white and black armor. "Steady. If you plant your feet a little wider you can weather any wind out here." Shiro had found it much easier to deal with the entire business by being out in the wind. It isn't much but it's something. He waits until he's sure his fellow outsider is steady before he moves to lean against the railing.

"Not used to flying?" Probably not. But it never hurts to ask and see.