[He'll protect you if it becomes necessary; not to worry. Even if Yuuri doesn't really deserve it after stealing Sebastian's master's coach... At least Sebastian's annoyed frown smoothes out somewhat when Yuuri seems to calm down - he just doesn't care much for others making a ruckus.]
Secondly, unsubtle as this world tends to be, it is typically straightforward about what it wants from us. When it decides to inflict danger upon us, we know within minutes. This [he makes a gesture towards the silly picnic basket] I believe to be a fairly clear indicator of the nature of today's spectacle.