This looks like a sweet moment, let me tell you what happened... . A few seconds earlier he decided he wanted to hold/hug her, but as you can see they're on a bus (what you don't see it!? What's wrong with you!? This is obviously a bus they're on) the bus turned a corner and he got carried away mid hug and he kind of dropped her, but caught her. He had the oops eyes, quickly sat her back up and gave her this hug which was a 'shhhh, don't cry I didn't drop you, you imagined it, shhhh'. . Yeah so that's called having a sibling.