[Pitch stops his pacing and his eyes widen at the sound of that oh-so-familiar voice. The sand on his Nightmare ripples and her ears fold back against her head. But soon Pitch recollects himself and the two of them turn to address The Guardian of Fun.]

Jack Frost. [His mouth turns into a crooked scowl] What a surprise to see you here.

[Pitch crosses his arms and soon smiles. Calm and relaxed, as seen in his slumping shoulders while his Nightmare looks off elsewhere.]

I work security here, along with some other duties. [The spirit wouldn't explain his other duties. Jack would retalliate, if anything. He takes out the invitation from the folds of his cloak, pointing to the mouse symbol on it.] Invited by the mouse himself.