Horatio blink and considers before leaving his perch and landing on Quirrell's arm. Lucius nods in satisfaction, speaking to the owl. "You're going with him, now...he's got mail for you to deliver."
He glances at Quirrell. "Do bring him back. If anything were to happen to him, it should be most unfortunate." For you. is the unspoken end to the sentence. He leads the way toward the door.