Taking a cue from Sam, Sebastian began to leave, as well, but decided to give another go at being polite, despite how it had not served him well thus far. He gave a large smile, although it came out more nervous than he intended, and it was, for the most part, genuine. "Sorry for all of this, I hope you all have a good day." There was nothing else to say, really. He had shown his idiocy far too much, and getting out of her was his priority now.
With a slight, awkward wave, Sebastian scurried off. No need to linger, he just wanted to get back to his room -- oh wait. He abruptly turned around just as he reached the staircase, and hurried back to the mailboxes.
"Forgot my mail," he muttered nervously. With that, he avoided eye contact with the others, and left as quickly as possible.