. . .you're a really good kid, Syaoran. But instead of being upset over that, I want you to think of it this way.
Pretend Sakura is still watching. Sakura, who knows Monoceros better than any other team could. She knows Monoceros will always be Monoceros--we don't need protecting. Instead she'd be much more worried about you and your team. She'd rather you do everything you could to protect your own loved ones, instead of burdening yourself with our troubles.
Don't feel guilty. You have your own precious people.