Sorin, unfortunately enough for him, was rather busy at around the time he got the letter - what with guards and other vampires being idiots and regularly wanting to smack his siblings around the head. As such he had simply let the letter drift to the bottom of his large piles and had forgotten entirely about it.

...Until now.

So, now he is standing in the arena looking rather ruffled, rather surprised and a little bit annoyed... Though the puzzlement rather takes over when he sees the TARDIS, the poor, faintly oblivious boy.

"...Well, this wasn't expected."