John was more interested in grabbing Marguerite's arms and ushering her into a private room, before she revealed herself as a vampire and a Frenchwoman, than dealing with the mayhem on the staircase. There was also the slightest chance she'd view this as an opening to mount an offensive against the priest.
He dropped his book on the floor with a great clap of noise and maneuvered himself into place by her side. "That was not a very nice thing to say, was it?" he muttered in her ear. He took her by the elbow and attempted to steer her back along the hallway to the room where he left his reading. "And I do not think it wise for you to have the chou-chou just yet."
On his way past Simon, he rolled his eyes in silent opinion of the man's great epiphany. So much for an amiable introduction of his friend to his love interest, should she ever stop pretending she'd never seen him before.