Syaoran's reaction on seeing his brother flee from the Ferris wheel (Takes place in the small space between chapter 13 and 14)
Syaoran slowly strolled over to Tomoyo and Sakura as they left the Ferris wheel. Sakura looked like she had cheered up a little, now smiling softly while Tomoyo chattered away. It was a shame things had turned out like that, Sakura panicking completely. Although it would indeed heighten his chances for Sakura to break up with Shirou – and hopefully noticing him, of course – he didn't like the sight of her crying face one bit.
He just reached the two girls when the cabin of his brother and Ryuuoh opened. He froze when his brother stormed out of the cabin as soon as he got the chance, his face white as a sheet and his eyes wide and shocked. Ryuuoh stumbled out after him, his face the opposite colour and beet red.
It didn't take a genius to figure out what Ryuuoh had done. There was nothing he could have said to make Syaoron react like that.
"Don't follow," he growled softly at the two girls, who had cried out in surprise. Tomoyo had been about to start running after his brother, but stopped dead in her tracks at his dangerous tone.
He stalked over to Ryuuoh, ignoring the two girls. Ryuuoh stumbled back when he saw him approaching, looking genuinely scared.
"Didn't I warn you?" Syaoran stepped up close, looming over the boy as he drew back in fear.
"Don't do anything to my sister she doesn't want," he growled. He lifted his arm and swiftly punched Ryuuoh in his face, making the boy topple over. He heard the two girls cry out in surprise again, and Shirou had come hurrying towards his girlfriend as well now.
Ryuuoh merely blinked up at him with large green eyes, a hand pressed to his bruised cheek.
"If I find out you did something like this without her permission again, it won't be just one punch."
Ryuuoh gulped, and nodded in understanding,
Syaoran turned on his heels and started running after his brother. It was a bit too cruel to break Syaoron out of his obliviousness in this way.