What if Cale had a habit of wandering to high balconies or roof tops and just sitting there whenever he was stressed/sad?
See it this way: Kim Rok Soo had the habit of roaming around destroyed buildings and finding a high spot and just sitting there? Perhaps he liked seeing the horizon. Or maybe he wanted to see how far the destroyed area stretched to. Or maybe he thought of it as his responsibility to look out for anyone injured, who may still be looking for help. Either way, it brought him peace, some sort of serenity and quietness.
So anyways, as Cale, after the conflicts with White Star started, his habit involuntarily reappeared. He would frequently go on roof tops, sometimes a tall tree or just sit upon the balustrade of his balcony. His feet hanging, his heart quiet and his gaze fixated on nothingness.
And now imagine someone, maybe Raon or Ron, catching him sitting on the edge of the balcony with a blank face. Then the panic, the chaos, and maybe Cale lost his footing because of the startling shout, and he fell down before balancing himself mid-air thanks to the wind ap.
Now imagine him trying to explain that it was just on a whim, that he has no intentions of hurting himself, but the children keep on sobbing and his family hang their heads down with despairing eyes, and now Cale feels helpless.
And maybe he feels a pang of guilt, because sometimes, just sometimes, he had a fleeting thought, a nonsensical urge to jump off, not to hurt himself, like he hated pain more than anything, and of course, living was the best, but there was the curiosity to see how it would feel, first the amazement, then the numbness, and finally the quietness of his Records.
It's only a thought, he convinced himself. But that didn't stop his habit, the worrying gazes of his family and their watchful eyes on Cale, and the relentless explanations that would follow, with Cale always failing to convince them that he is fine.