Isaac clambers onto Artax, seeking no small amount of assistance from the boy. He looks out-of-sorts on the beast. He looks at his floating mechanical companion with a beleaguered look on weathered visage.

"Vesper, how do you ride one of these!" He whispers to the A.I. conspiratorially, though the machine seems to have no grasp of secrecy or tact.

"Consulting Net reference. Error: Net connectivity insufficient. Consulting local memory. Entry for 'Horse riding' not found. Sorry Professor."

The man frowns, and gently shakes the reins of the horse, his tone meek and questionable: "Giddyup?"